Exactly. there is literally no difference in what you're wearing than that of a different person wearing a bathing suit. In fact, you're covering up WAY more than what a lot of women (and men) wear at the beach covers up.
Men walk around with no shirts on. Slap an NSFW tag on those guys.

If it's because of the suggestive nature of the pictures, then every flirty little teenager blasting their provocatively-posed duck face pictures around everywhere on their social media sites should be locked right up into the basement of a nun convention.