Oh, i'm pretty sure than that was the original intention and Dixon would never let Tim gone into the evils of teenage sex .Tim is not asexual. He is just shy and acts awkwardly around girls. Not every teenage boy is a Don Juan.*
Just an idea that pop in my head during Lewis run. Also i'm probably being insensitve, but that monologue of Tim thinking "Isn't this pretty much how we ended up with Damian?" just make me chuckle