In one of the first SE 2.0 sites, a meta question was asked about whether adult web applications are allowed. The answer given was:
No, I don't think we want this, as it would cause us to get globally banned from web filtering software.
So including adult links, or even mentioning adult sites by name, is explicitly not allowed.
In a follow-up question, the content policy was quoted:
Our Content Policy reads:
Sexually Explicit Material. Accounts that use Stack Exchange to post sexually explicit or pornographic material, or links to it, will be suspended.
Does this still apply? I welcome having a site to talk about sexuality but does its existence on the stackexchange.com domain affect the filtering for other SE sites?