Yeah and a majority of hands you shake have touched a dick.
Self-satisfaction?
Huh?
Masturbation
Heterosexuality and homosexuality are subsets of allosexuality (sexual attraction and behavior towards others). Autosexual acts such as masturbation are not allosexual and so do not contribute to heterosexual or homosexual identity.
Example: A lesbian trans woman might masturbate using her penis, even though she has no attraction to penis-havers, just because she happens to be equipped with one.
Example: A heterosexual cis woman might masturbate using her vulva, even though she has no attraction to vulva-havers, just because she happens to be equipped with one.
Good shower thought
I think there are too many women who never do that to speak of ‘almost every heterosexual’.
They just aren’t telling you about it.
I’m talking about the various studies on the subject. Those might have similar issues of some women being unwilling to tell anyone about it, but AFAIK the experiences of (regular/sex/couple) therapists doesn’t really contradict the studies.