Do men actually imagine having sex with every woman they meet?

No the hell we do not. I’d say that happens basically never for me, and probably more often for some men. But even women I find attractive I very, very rarely think about sex with them or what it’d be like (maybe once every 2-3 years if that?). Even then it’s a fleeting thought and not really anything substantial.

This was true even when I was 18-22 by the way.

That men are just ravening sex beasts is just not true.