Sex becomes not quite as important as you get older. You seem to be literally unable to imagine not being erect in those circumstances so just imagine people who could imagine not being erect in those circumstances and you'll find your way.

Also, much of women's clothing is basically lingerie, especially summerwear. The clothing was designed, fitted and created to tittilate, even if that's not the women's intent herself.

From yoga pants to croptops, clothing is meant to show off the female figure while still not revealing anything (the definition of lingerie).

I honestly think if everybody in warmer climates went around nude, we'd have a MUCH healthier sexual culture.