S: (n) bondage (sexual practice that involves physically restraining (by cords or handcuffs) one of the partners)
S: (n) outercourse (sexual stimulation without vaginal penetration) "since pregnancy cannot happen if sperm are kept out of the vagina, outercourse is one method of birth control"
S: (n) safe sex (sexual activity (especially sexual intercourse) with the use of measures (such as latex condoms) to avoid the transmission of disease (especially AIDS))
S: (n) conception (the act of becoming pregnant; fertilization of an ovum by a spermatozoon)
S: (n) fornication (voluntary sexual intercourse between persons not married to each other)
S: (n) incest (sexual intercourse between persons too closely related to marry (as between a parent and a child))
S: (n) pleasure (sexual gratification) "he took his pleasure of her"
S: (n) sexual love, lovemaking, making love, love, love life (sexual activities (often including sexual intercourse) between two people) "his lovemaking disgusted her"; "he hadn't had any love in months"; "he has a very complicated love life"
S: (n) carnal abuse (any lascivious contact by an adult with the sexual organs of a child (especially not involving sexual intercourse))
S: (n) coupling, mating, pairing, conjugation, union, sexual union (the act of pairing a male and female for reproductive purposes) "the casual couplings of adolescents"; "the mating of some species occurs only in the spring"
S: (n) assortative mating (mating of individuals having more traits in common than likely in random mating)
S: (n) monohybrid cross (hybridization using a single trait with two alleles (as in Mendel's experiments with garden peas))
S: (n) reciprocal cross, reciprocal (hybridization involving a pair of crosses that reverse the sexes associated with each genotype)
S: (n) testcross, test-cross (a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring)
S: (n) fetishism, fetichism (sexual arousal or gratification resulting from handling a fetish (or a specific part of the body other than the sexual organs))
S: (n) voyeurism (a perversion in which a person receives sexual gratification from seeing the genitalia of others or witnessing others' sexual behavior)