It's funny what we're attracted to. I like seeing stiff nipples on small, perky breasts, but it doesn't "do" anything for me, it's just attractive. Cameltoe on the other hand ... that makes me hard. I love seeing it. For neither of them are there judgements. I may judge you on OTHER aspects of your appearance and/or behaviour, but not on that.
One of my FWB always makes sure that something is noticeable. Nips, camel toe....whatever. She likes to watch men trying to watch her and we talk about it after. And yes, after a while, her nips get hard and she gets moist. Doing it for years now.