It's the difference between being at a beach with people in bathing suits and just doing normal beach stuff... and one of those people moving their beach towel and umbrella so that they're directly in front of you, while making hard eye contact, then proceeding to stretch suggestively, wink at you occasionally, moan from time to time, and "accidentally" drop things in front of you with bizarre frequency so they just "have to" keep bending over in such a way that you get a great view.

One's not sexual. The other one super-duper obviously is, to everyone involved, even if the bathing suit stays on.