Going to xth the chorus of posts saying 'omg masturbate', that whole antifap shit is another method to control people using bourgeois morality. If you get rid of that urge before you won't be so thirsty in your dreams.

Anyway, like RL you have varying degrees of awareness and ability to act on autonomy in a LD, so don't feel too bad when you sleep into a habit. It helps to have a list of non sexy things to do when you LD and incubate those before bed.

Big spoiler for LDs, expectation is the law of dreams, you expect sex to mess up stability it will, a very common one is people thinking merely being excited about LDing will interfere with the LD. Even larger spoiler, no it won't, manage your expectations and it will lead to better control. A more material hack is rubbing your hands or spinning helps with control, why, something about proprioception and pattern familiarity-expectation if I had to guess. If you ever figure out how to feel that you're lying down sensation that makes a good reality check, one doesn't walk around life with the sensations/pressures of lying on a bed. Makes me think of a video game glitch.