I do not code apps or anything really, so I have never done this, but if you want to get it approved on Google Play store then you can forget about it since they do not allow anything adult related.
You could promote it by buying mobile traffic from JuicyAds or PlugRush but I can not tell if it would do well, since I have no experience of doing this, as I said before. You need to experiment and maybe someone that does something similar will chime in and give some feedback.