I remember when a teen, I naively asked to a girl in my school: what do you feel if a boy touches your tits? And she answered: it depends who the boy is. This was hard to understand at first, as a boy, but in the following decades I verified that what the schoolgirl easily told it applies globally and can't be said in shorter format. I could add that a girl it can close eyes and think at boy2 he likes, while having sex with boy1, so he could enjoy boy1's sex
