Upload sexy teaser videos on YouTube and leave a link in the video description that takes the user to your website, write something like "
Want to see more sexy girls? Visit blablablah.com".
You could also do some Keyword Research and find very specific keywords to target that could bring in some traffic, the phrase "thick latinas" gets over 2K global searches a month, that could bring in 70+ unique hits a day and it won't be much of a challenge to get the #1 spot on Google.
I wouldn't suggest link exchanges with other porn sites, people simply won't click on links when their too busy jerking off.