It's probably the fact that they're smelling your testosterone levels.
Some of it COULD be the weather because it was so nauseatingly hot this summer that it was difficult to enjoy anything that included getting out and about.
Although I haven't met you, I've heard nice things over the years
and so I would guess that if a woman just imagines that you're a healthy cornfed man with normal desires (it's more difficult to find those types of men who are available than you might think!) ... then it's hard to turn that down!
Lucky bastard!!!
Elisabeth