I also don't have a problem with casual sex as long as it's consenting, so to be honest if that is part of gay culture now I couldn't care less. Public sex for straight people is common too
The reason this has come up as a topic, though, is due to Peter Tatchell trying to push this kind of 'free sex' agenda onto children. The idea of enforced public, mixed sex sex sessions/lessons on everything from masturbation to BDSM.
The difference between debating promiscuous gay male culture and women's boundaries, is that one seems to be a no-go area ( homophobic if attempted - even by gay men) - whereas women's boundaries are up for the taking without any discussion at all.
I really don't think that pubic sex is that common for straight people at all. Apparently, and again, according to Jeffries - when public sex was trialled in lesbian venues in the 1970's it never took off. Women, it seems, are not really into public or 'performative' sex.
What we do have now though is the promotion of prostitution as a liberal free act of the individual, and of pornography - even though much of that is inimical to the rights and dignity of women - certainly according to radical feminism - which is what how most of the women here would probably be described.