A couple of girls I've spoken to over time have said that sometimes with some clients they would like him to slip in and let it go!, and yes they did know the risks and all that but it did seem if they were well turned on they would give into their desires!
No names, all now retired!
Thats my view of this, in the early 80's while seeing girls at glasgow massage parlours, some of them didn't mind if you came over their clit's, and one or two didn't even mind if it slipped in
Knew of one girl who worked from the massage parlours, she would blatantly offer unprotected sex, but the owner found out one day, and chucked her out
Were they turned on, hard to day, but think back in the old days, 70's - 80's a lot more was going on than we knew, and hiv was a risk, but it how it was looked at, by everyone
And like me, all these girls have retired