As long as they opted in, make sure to have an unsubscribe link as well message in the footer why they are getting these emails and who you (not you, your business) is. Depending on your state, some require that you put a physical address, but that can just be a link in a privacy policy.
My law degree over covers up to this point, I got to wasted and never went back but I would have to guess stay away from "R" rated content, or anything that would not be "PG" compliant. You probably need to have a disclaimer about "adult content for fuckers that are 18 or older"
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