There's nothing to be embarrassed about. If I were interviewing you, I would hope you would frame your experience in terms of what you did, that was technically

There's nothing to be embarrassed about. If I were interviewing you, I would hope you would frame your experience in terms of what you did, that was technically interesting, as opposed to the nature of the site...but, obviously don't lie about anything. I'm positive that I wouldn't care anyway. Also, small startups are filled with guys that watch porn and are pretty open minded. Good luck!