The H1 tag should be your main keyword. I would suggest only to use it for your titles on your adult website. The H2 tag is a subheading and H3 tag is a subheading for the H2 tag and so on.
Keep in mind that stuffing your headings with your keywords is dangerous and may even lead to some kind of penalties for keyword stuffing.
If you really want to use heading tags then here is an example how to use it:
Heading1Tag Tori Black Is The Hottest Porn Star /Heading1Tag
Text Here
Heading2Tag Who Is Tori Black? /Heading2Tag
Text Here