The third example shows an image of a topless female and male laying on the floor apparently hugging each other.

That's inappropriate? For whom? Puritans? Orthodox Jews?

Seriously, my Newsprint theme is being used by multiple pornography blogs, even though it wasn't in any way designed or targeted for that market. Conversely, I can easily imagine someone being attracted by a sexy thumbnail even if they want the theme in question for a perfectly work-safe blog. Sex sells, yes, but that's true anywhere and any time.