It has either popped up as a result of your search parameters, or you mentioned something like "bondage with College girls" in passing conversation with someone and your phone was in listening distance.
It is not the site soliciting for ****.
If you guys have a smartish phone nearby and you say something, it will pick up on it usually. My wife came home yesterday and told me she had broken a filling in a back tooth....within 30 minutes she had around ten advertisements for Dentists in our area - and that was on an iPhone that is about 8 years old now.