The word sex means a lot of things. In popular culture, sex refers to gender, to sexual intercourse, and to physical intimacy with or without sexual intercourse. The word sex is used in any and all connections to the imagery, sounds, rhythms, emotions, and desires that promote the frequencies of sexual energy.
In science, sex is the combination of genetic material from two organisms. This usually results in reproduction, the creation of new organisms. Sex may occur without reproduction being directly attached, as in some varieties of bacteria that exchange genetic material without reproducing. Reproduction can also take place asexually, where the parent organism reproduces its genes and buds off a new individual that is a clone of the parent.