My thoughts:
1. underwatersexcam.com
The domain is too long and sounds like a webcam site. Personally I would use a better domain name.
2. Affiliate
I clicked on your affiliate link. It was verotel. My thought is, you may find you get more affiliates if you use ccbill.
3. Trailer
I looked at your 720p trailer. I think you should post min 1080, as even the text on the vid looked blurred.
https://www.underwatersexcam.com/?mb...xjdG0xMTYzODQ5
4. Design of site
It looks a bit flat and unexciting.
5. No models on the site
I had a look and I could not see any faces of any models, just pics on people below the head. I personally would want to see who is on your site before I join.
6. Content
It looks blurred. Even with a gopro, you should get sharp quality. For underwater, it looks very bad.
However you seem to have a decent amount of content.
Personally I would have filmed both above as well as below the water.