Ruby:
In the late 70's and early 80's at least 1/3 of the ladies did not WANT a condom... The number of times I asked for one and got a VERY pained look (or comment) has always surprised me...
I had the same experience, back then.
Curious if some courtesans back in the day thought they could make bigger bank "trapping" a client with a pregnancy. 
Like "oh I got pregnant and the timing of it my party was with you so you MUST be the father - ok pay up". Otherwise that's just asking for a bad time.
How would they have though? Back in the day there was not a reliable paternity test and they would have had to been very slow business wise to rely on the timing.
Well, I'm going to go by a scenario that happened recently to a young man in the early 2000s. He was dating and sleeping with a young woman while not knowing she was doing the same with several other men at the same time. She got pregnant and told him without a shadow a of a doubt because of the timing he was the father. She did the same to the other men she was seeing. He caught on there was something funny going on when a friend tipped him off she likely wasn't loyal but he still felt guilty and helped her out. Some people think they're master geniuses who can manipulate multiple people with a stunt like that for more money. It's not actually smart, it's very reckless, but that is logic some people do possess.
This is why condoms, and other forms of birth control, are great! (Unless you are in a committed relationship and planning a family or a single person prepared to support the care of a child yourself, as is the case with some single women who knowingly get pregnant and do not hold the father responsible or use donor sperm.)
