What are the Black Hat Tactics on getting Backlinks from big Adult Forum sites?

[vintageadult]

Most of adult and non-adult forum sites dont allow links to outside but their moderators/admins may have miss (cant see) some of black hat tactics that you do on their forums.

What are your black hat ways to get backlinks from big adult forum sites?

How can we put our links free on the forums without catching to the adult forum moderators?