Drawstrings

[Torchwatch]

A smooth front men's swim bikini or a smooth front men's swim brief do not have an obvious front pouch but the fabric at the front of the suit is wider than then fabric at the rear of the suit when sewn into the gusset seam. This subtly allows room for a man's parts without the use of a half, single or double sided pouch.

The fabric of a women's bikini is the same width front and back when sewn into the gusset seam as there is no expected need for extra space at the front.

When a man wears a women's bikini for swimming he is pushing the design to the limits and may easily pop out especially when he gets it wet.

Do men that wear women's bikini bottoms do so because they like the design, the colours and patterns or simply because they are for women?
If it is the colours and the patterns of women's bikinis that some men like then a men's swim bikini or brief could be made from those fabrics but be better fitting.
If it is the knowledge that you are buying something designed and intended for women, then just carry on.