Is there such a thing as too much sex in an erotica? Therein lies the question.
Some novels are external plot based, some are character based. Normally in an erotica, the plots are character based which naturally involves more sex--like every 2 scenes. Are you interested in the sexual content or do you want the story to drive you toward the sex?
I prefer a story that wraps me up in the plot and gives me fun sex with the main characters along the way. I have friends who read it for various sexual scenes, but they tend to read more character-driven books with very little external conflict.
Which do you prefer? Either, both? A combination thereof? Depends on the mood? (you may take that pun or leave it *G*)