So, again, posts are slow and I'm just personally responding instead of posting because it's faster. And could that person who emailed me about wanting to share summer publishing experiences re-email me? I think I accidentally deleted it in a haze and I did mean to respond.
Suppose you are trying to get an agent or publisher interested in a literary fiction novel. You haven't any previous credits along those lines, but you have written (under a pseudonym) erotica. I don't mean on fly-by-night websites or in books that are delivered in a plain brown envelope, but in major magazines you would find in a good magazine shop or in anthologies you would find in major bookstore chains. Would this help even if your literary fiction novel isn't erotic? Or would such a background be the kiss of death?
Absolutely not. Literary agents and other people in the publishing world have a general respect for all types of writing that is quality, and don't have any qualms about erotica existing, even if they don't read it themselves. And it's not all Harlequin romance stuff either. There is now a healthy amount of independent presses who publish quality erotica, either for general interest or gay/lesbian. The target audience is almost exclusively women or gay men, mainly the former. Studies have shown that women in general don't like visual pornography and prefer it in prose form, which is why Playgirl failed. But let me stop talking about what we were learning in the magazine class I'm in and get back on topic.
Mention your serious publications. The only time I would leave them out is if you are submitting to an agent who mainly handles religious fiction and non-fiction. That might upset some sensibilities, but most agents do not fall into this category.