Here's my dare...
Go to a public swimming pool. Get some white bikinis, and make sure in your bikini-thong there is no protecting extra layer. So cut that part out, so that when it gets wet, your pussy curves can be seen.
Now at least do this once:
Dive into the pool of 1m50 appr. where at least 5 or more other people swim. Once dived in and under water, you quickly slide your bikini-bra aside, so that when you come above the water your nipples can be seen and shown.
The dare is that at least one man or woman must have seen your nipple(s).
Please let me know how this went and how you experienced.