People use pseudonyms for all kinds of reasons, and keeping some of your creative work apart from the rest also makes sense often enough. It's not about standing up to what you create, or failing to. It's about feeling comfortable showing it off. So don't feel like using a pen name is an act of cowardice or anything. Especially in that particular industry it's just common sense... and common practice. But you know best.
Good advice! I also thinks most people who consume smut would prefer a certain distance to the creator, since the stuff is kinda intimate.
One of the true wonders of the internet is that one can have several identities. It gives a lot of freedom to just be ToastMaster III, without being burdened by whatever identity you got stuck with in real life.