What separates a spammer from anyone else showing off their project here on HN? Just because this is in an industry that rarely shows up on HN doesn't automatically mean it's spam.
Logically the answer is "Time" and "Karma". You've been here for less than two weeks and you've submitted a porn-based submission. I'm calling shenanigans. If you'd been here a year or four + had 500+ karma and had done this, the rest of us would've believed you.