Even identical genital acts mean different things to different people.
Sexuality makes up a large share of the self-perceived identity of some, a small share of others.
Some spend a lot of time thinking about sex, others little. Some people like to have a lot of sex, others little or none. For some people, their sexuality provides a needed space of heightened discovery and cognitive hyperstimulation. For others, sexuality provides a needed space for routinized habituation and cognitive hiatus. Some people like spontaneous sexual scenes, others like highly scripted ones, others like spontaneous-sounding ones that are nonetheless totally predictable.