sex, sex activity, sexual activity, sexual practice - activities associated with sexual intercourse; "they had sex in the back seat"

assortative mating - mating of individuals having more traits in common than likely in random mating

disassortative mating - mating of individuals having traits more dissimilar than likely in random mating

hybridisation, hybridization, hybridizing, interbreeding, crossbreeding, crossing, cross - (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids

inbreeding - the act of mating closely related individuals

servicing, service - the act of mating by male animals; "the bull was worth good money in servicing fees"