Nimoy spoke at my college shortly before the movie came out. During the Q&A session, somebody in the audience pointed that there really hadn't been any sexy bits in the first two movies, unlike the original TV show.
Nimoy was coy, but teased the audience by hinting that there might be a bit of sex in the new movie . . . .
I assume that Savvik and Young Spock was what he was alluding to.