sentences: sexual reproduction requires both sperm and egg
docs: sexual_reproduction is reproduction. males has sex_with_females mating_factor is mating_factor. reproduction is sexual_activity. assortative_mating is coupling. sexual_intercourse is mating. mating_of_haploids is mating. mating is multiple_doer_action. egg_fertilization is reproductive_fertilization. sexual_reproduction is biological_reproduction.