Planets in another person’s first house/Planets conjunct the Ascendant: The Ascendant and first house represent our physical appearance and the way we project ourselves to the world. When you have planets in your partner’s first house, or vice-versa, a strong physical attraction is indicated. A woman’s Sun and Mars (masculine planets) represent the kind of man she finds attractive, so having either of these planets in her partner’s first house indicates considerable attraction on her part. A man’s Moon and Venus (feminine planets) indicate the qualities he looks for in a woman, so having either of these planets in his partner’s first house is indicative of physical attraction.
Planets in the 7th house/Conjuct the Descendant: The 7th house and Descendant represent our one-on-one relationships, and describes the qualities of our ideal mate. Thus, having planets in someone’s 7th house in synastry is indicative of mutual attraction. The planet person represents the qualities we lack, the qualities that will serve to “balance” us out. The house person is likely to find the planet person as someone who is “marriage material,” while the Planet person is likely to find the Ascendant person highly attractive. The strongest indicator of physical attraction is when someone’s inner planets fall in the 7th house (especially the Sun).
Planetary overlays in the 5th house: The 5th house represents fun and romance. So, if your planets are overlaid onto your partner’s 5th house, a romantic and sexual attraction is indicated. You love spending time with one another, and the planet person stimulates the house person’s desire for love, sex, and romance. This is especially true if the planet is Venus or Mars; you literally want to jump the person!
Planets in 8th house: The 8th house represents sex and intimacy. This is thus a very powerful synastry overlay to have between partners. In this case, the planet person stimulates the 8th house person’s desire for intimacy. The 8th house person wants to “merge” with the planet person and explore the depths of her sexuality. Hot, hot, hot! This is especially true if your partner’s Venus or Mars (sexual planets) fall in your 8th house. It’s practically irresistible. The 8th house person may even become obsessed, so watch out! This is definitely not a synastry aspect for the faint-hearted.
Sun-Venus synastry aspects: Venus is the planet of beauty and pleasure, while the Sun represents our core being. Thus, synastry aspects involving the Sun and Venus are indicative of a strong physical attraction, especially on the part of the Venus person. The Sun person represents what the Venus person finds beautiful and pleasing, and the Sun person gets a huge ego boost from this! The Venus person adores the Sun person, and the Sun person loves the Venus person’s style and grace. This is a highly romantic aspect, and is one of the best indicator of a lasting romance.
Sun-Mars synastry Aspects: Both the Sun and Mars are masculine signs. When they make an aspect in synastry, sexual compatibility is indicated. Your body rhythms match well, and you naturally know how to please one another. Mars is especially sexually attracted to the Sun person, and the Sun person’s sexual desires are stimulated by the Mars person. This aspect represents considerable attraction to each other’s bodies. This is especially true for the conjunction, trine, and sextile. The opposition and square can lead to conflict and ego clashes, but attraction is still indicated.
Venus-Pluto Synastry Aspects: This is one of the hottest sexual synastry aspects two people can have! Pluto represents sex, obsession, and intimacy, while Venus represents love, beauty, and affection. Together, this spells g-r-e-a-t s-e-x! You stimulate each other’s desire to experience the depths of sexual intimacy. Physical intimacy is especially important with this interaspect; you feel a strong desire to be physically close to each other. In fact, you may find you become obsessed with one another! This aspect also indicates power struggles and domination, especially on the part of the Pluto person. The Pluto person feels a strong desire to “merge” with the Venus person. Pluto finds Venus beautiful and intriguing. Venus is strongly sexually attracted to Pluto, as Pluto puts her in touch with her primal, sexual feelings. This is especially true of the conjunction. The trine and sextile indicate intense, but pleasing and harmonious sexual interactions. These aspects deepen the intimacy shared by the couple, but not in an overly obsessive or destructive way. In the case of the square and opposition, strong sexual energies are also indicated, but this may be accompanied by an unhealthy desire to control one another through manipulation, jealousy, and possessiveness. The square and opposition can also indicate sexual and financial exploitation, as well as abuse. Nevertheless, Venus-Pluto in synastry is just plain hot.
Moon-Mars Synastry Aspects: In synastry, this is a sign of true sexual compatibility. The attraction is instinctive in nature. This aspect is considered best when the woman is the Moon person, and the man is the Mars person. Like Venus-Mars interaspects, Moon-Mars interaspects represent the yin/yang or male/female energies between couples. The Mars person can instinctively sense the needs of the Moon person, and strives to fulfill them. The Mars person is attracted to the Moon at a very basic level; he finds her basic femininity very sexually appealing. The Moon person is “turned on” by the Mars person’s advances. The attraction is very primal in nature. Together, they fuse emotionalism and feelings into sex, which can be highly satisfying for both parties. I believe all Moon-Mars contacts, whether hard or soft, brings this energy into the partnership. However, the hard aspects can manifest outside the bedroom as emotional arguments and hurt feelings, while the softer aspects indicate supportive energies between the two.
Venus-Mars Synastry Aspects: This is especially potent when the woman’s Venus is being aspected by the man’s Venus. Even better is when you have a “double-whammy”; when your Venus aspects your partner’s Mars, and when your partner’s Mars aspects your Venus. Venus is the planet of love, affection, and romance, while Mars is the planet of raw sexual energy. Together, they make fireworks! The Mars person feels adored and loved by the Venus person, and finds them beautiful. The Venus person is energized and sexually stimulated by the Mars person. When this interaspect shows up in synastry, true sexual compatibility is indicated. This is especially potent when the woman’s Venus is being aspected by the man’s Mars.
Ascendant/Ascendant Aspects in Synastry: I really don’t think this synastry connection gets enough attention! The Ascendant represents our physical appearance, and the way we project ourselves to the world. Thus, aspects (even hard ones) between two people’s Ascendants indicate considerable attraction. This is especially potent if your Ascendant opposes your partner’s Ascendant (or your Ascendant is conjunct your partner’s Descendant). In this case, your partner is likely to consider you to be the “perfect partner,” in terms of your physical appearance. As a Sagittarius Ascendant, I attract Gemini Ascendant men like crazy!
Eros Synastry Aspects: The asteroid, Eros, represents erotic love, sex, passion and intimacy. I have found that when someone’s personal planets make strong aspects to someone else’s natal Eros, a strong sexual bond and attraction is indicated. I’ve found that the Eros person has a “crush” on the planet person. This is an indicator of great sex, too!
Aspects to Lilith in Synastry: In synastry, Lilith brings an untamed, wild sexual energy, feelings of obsession, and intense, transformative interactions. When your Lilith aspects your someone’s planet (especially the Sun, Moon, Venus, Mars, or the Ascendant), you are magnetically attracted to this person, and can’t get them out of your mind. This aspect shows an amazing amount of sexual chemistry and an obsessive attraction.
Like Pluto, Lilith aspects in synastry act to draw out each person’s sexuality. Lilith sex is tantric, obsessive, and highly addictive. Couples with strong Lilith in synastry have an incredibly strong sexual attraction to one another, and it is difficult to keep them apart! You will find strong Lilith in the synastry charts of couples involved in extramarital affairs. Indeed, Lilith represents the qualities a person looks for in a mistress, while Juno represents the qualities of the wife.
Actually my girlfriend and I have like 7 of this aspects, it's kind of weird I guess, but somehow it would explain why we felt so attracted to each other since the first moment we met. Now everything makes sense.