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In astrology, every aspect of life is revealed chiefly by planets.  It is Planet who owns Rashi, Nakshatra, Navamasha etc. However, House, Sign, Nakshatra give further insight into the matters.  In Vedic Astrology, Sexual life is studies taking into consideration the sign to which a person belongs and placement of planets in the 7th House.  Mars and Venus have important role in Sexuality and its performance.  Therefore, accidental placement and condition of Mars and Venus are necessary to study.   
Sign in 7th House and Sexual Behaviour

Fiery Sign (Aries, Leo, Sagittarius) in 7th house, indicates that native enjoys while performing sexual act.  In such case, native is found more interested in sex and more involved in sexual activities.   And, he takes long time to reach on climax during coitus.

Earthy Sign (Taurus, Virgo, Capricorn) in 7th house shows that native is  practical and sober in sex behavior.

Airy Sign (Gemini, Libra, Aquarius) in 7th house indicates that native is having secret liking for sex and try to conceal their sexual feelings. In discharge he takes normal time.

Watery Sign (Cancer, Scorpio, Pisces) in 7th house shows that native is highly passionate feelings.  However, they are not very sex oriented.  He gets discharged quickly.

Moveable  or  Dual Sign in 7th house indicates that native like to separate immediately after intercourse.

Fixed sign in 7th house indicates that native like to remain in deep embrace after coitus.

 

Planet in 7th House and Sexual Behaviour

 

Sun is in the 7th house shows aggressiveness in performance.
Moon is in 7th house indicates native’s excitement and readiness for sex.  
Mars is in 7th house makes native vigorous & impatient while doing sex.
Mercury is in the 7th house makes native to suffer from premature ejaculation or nervous exhaustion.
Jupiter in 7th house shows engagement of native in ardent love.
Venus is in 7th house shows love for sex.  Such desire for sex makes native aroused and causes quick discharge during performance.
Saturn in 7th house gives cool sex with mean outlook on sex union.
Rahu, if, is in 7th house, it shows that native is stealing something.
Ketu in 7th house makes native hypersensitive resulting in premature discharge.
Mars & Rahu in 7th house shows native’s inhuman sexual behavior.
Saturn with R/K in 7th house indicates animal like behaviour in sex act.  If three kendras are under influence of malefic planet, this is indicative of animal-like attitude for sex in native.

 

Nakshatra in 7th Cusp

 

a)    Ashwini, Mrigshira, Magha, U. Phalguni, Anuradha, Moola or Dhanishtha  in the 7th cusp indicates hyper-sexuality.
b)    Bharani, Aridra, Pushya, P. Phalguni, Hasta, Swati, Sravana, P. Ashadha or  Revati indicates moderate sexuality.
c)    The remaining mask their feelings though they crave for sex.

Feelings for Sex Act

 

It is seen from 8th house.  8th house lord or planet in 8th house indicates feelings of native in sex given below:
Sun in 8 H or 8 L : Passionate feelings about sex.
Moon in 8 H or 8 L : Interest in sex.
Mars in 8 H or 8 L : Sex life becomes important.
Jupiter in 8 H or 8 L : Disciplined in Sexual act.
Mercury in 8 H or 8 L : Interest in sex and arousal of emotion by others.
Venus in 8 H or 8 L : Harmonious Sexual  act.
Saturn in 8 H or 8 L : Sensual but inferiority complex and frigid outlook.