Why are you coming to the conclusion that people are having bad sex because they find one particular act painful and/or just don't want to do it?
And just as clearly as it must be pleasurable and not painful for many women - it is clearly not pleasurable and is painful for many women.
The anal sex men see in porn is portrayed just like PIV. Shove your dick in the hole, pump away, and Bob's your uncle.
That's not great for the cohort of women who do find it painful.
And no, lesbians don't do anal. Some lesbians do - the ones who don't find it painful and/or who like pain.
And more than likely they'll have a partner who'll work with them on it (all the prep that's needed). And, crucially, won't be penetrating them with an organ that will cause their own orgasm. If you're penetrating with an inanimate object, that's quite different from a penis that's building up to orgasm.
Again, the women who like it can get on with it - no-one's stopping anyone from experimenting sexually.
And mostly the only people I know who are into it are gay and lesbian.
Is this a typo? Because if not, you're kind of agreeing with me. I did say it seemed to be straight men that don't seem to be so keen on anything that might involve a bit of pain.