Since 50 Shades, the fact that erotica is a thing that people legitimately like, whether they are ashamed of it or not, has become public knowledge. As a result, erotica is a rather trendy thing to have read, to have in your library, etc.
Love erotica, but want to read something seasonally appropriate? Never read erotica, but want to give it a try? Want to get in on the latest reading trend? A short story anthology with erotic elements is a great way to fulfill all of these reasons.