There is no artificial birth control used - the couple uses 'natural family planning' meaning sex occurs only during infertile times of the female's ovulation cycle. The slapping sound is made from the male's lower abdomen and testicles rhythmically striking the female's bum during rapid penetration - the female is kneeling on the edge of a bed and the male is standing on the floor. Both are rather slender, and have already had orgasms from oral sex. Recorded in September 2016 in a California dorm room: female is Asian, 19 y.o., male is White, 21 y.o. This 6:17 minute cut from a 25:00 PiV (Penis in Vagina) sex session that features loud doggystyle sexual intercourse between two young consenting adults.
