If we could barely arrange to have enough sex to cause 2 pregnancies per lifetime, then we would have a revulsion of condoms, oral sex, etc.

If that were true in the ancestral environment, and we had access to contraception in the AE, yes. I doubt a person who now found themselves in this situation would develop this revulsion.

I've read about africans who specificly get hungry for meat, who identify the specific feeling of protein deficiency.

[anecdote] Is this surprising? I've always been able to tell whether or not I need proteins/carbohydrates/fat (usually acting accordingly), and kind of assumed other people had the same sense. Of course, this is a fairly weak sense; calorie-rich food still tastes good when I've had too much, and it still takes willpower to stop eating it. [/anecdote]