Yeah, but strenght in this case is exactly the sexual feature in men.
To take two very recent examples, the shirtless scenes in CA and Thor: in one of them, Hayley Atwell's first moviment (as of any other girl in her situation) is to go touch his hypertorso in all curiosity; in Thor, Kat Dennings makes that homeless person remark.
The subtext is obvious: strenght, in men, is seen as the attractive feature. Thus, it's the same with girls: when they show their beautiful lines, there's immediate sexual innuendo.
It's the same thing.
And what's the problem with sex, anyway? You see, Woody Allen, that famous philosopher, says there are only two things in life: sex & death.
Well, perhaps only one thing, cause death would be better defined as already
out of life.

t: