The Tapastic community really isn't that sensitive, and if someone politely requested recs for straight romance comics, I doubt there would be much, if any, negative reaction to that. The OP here was polite, and and made no disparaging remarks about straight people, merely expressed a preference. And let's be real, straight characters are absolutely everywhere, and dominate every form of media, so if someone is interested in LGBT characters, they really do have to specifically mention it.
For the OP, I can't really dig through my reading list from work to recommend anything, but for now I can offer a shameless plug for my own fantasy comic which features a bit of romance: http://tapastic.com/series/lemongrass