In the Film Risky Business, Tom Cruise has a dream where he screws the babysitter on his parent’s dining table. The cops surround the house and get on the bullhorn. The senior negotiator (don’t ask me why this is a hostage situation requiring police attendance) shouts “… you are surrounded, get off the babysitter”. LOL
Hormones cause young men to have the most amazing and intricate fantasies. And those fantasies can be about anyone they even vaguely fancy. It’s a time in your life when you are asking your self questions like “Am I gay, straight or bi?”, “Do girls like me?”, “Is Darren pulling my leg when he says that you can get a blow job from a vacuum cleaner?”
Nobody should feel guilty about the regular and often graphic flights of fancy they have at that age.
When should you stop thinking like that? 18, 20, 30?
At some point you stop actually believing that you could do that thing with that girl with a bath full of jelly – sorry? That’s just me then? Gulp! – there has to be a point in your life when you realise that fantasy is not going to turn into reality, well not the really weird fantasies anyway.
What I would say is that you should never feel guilty about a fantasy you have (within obvious, sane parameters) because having those fantasies means your sexual brain is working and as we all know the brain is the body’s biggest sex organ. If you’re exercising that it has to be good for your partner and you.