I think it should only be promoted through a bureau name if it were to be an /ad. Such as "You're bored tonight? Visit "bureau name/website" for a good time." for example. Make a business topic on forums etc. Or work through Facebrowser. Lots of opportunities.
ERP should definitely be allowed. If people don't like it, then don't do it. Same goes for gore/torture/rape RP. Always ask the other part for consent. People should be old enough to know when enough is enough and when they don't want to participate in the roleplaying session that is about to evolve.