jbayabas - 2:49 am on Dec 3, 2012 (gmt 0)
Unfortunately, yes. Adsense requires all content to be "family safe." Topics such as sexual health or sex tips are not allowed. Even words such as "quickie" and "sexual intercourse" are considered stop words which cause Adsense blank ads to be shown.
If you want to be sure, you can also request a Policy Clarification regarding your site's specific content via Adsense support email.