Your abuser might well be a serial offender. To drug someone means it was premeditated. If he is a repeat offender, then the police will have a record. I wonder if making a formal complaint will go on his record and then help him get marked a repeat sex offender? I don't know the system.
Did he show remorse? Would he agree to conselling if you don't file charges?
Many people are a mixed bag of darkness and light, and some are remorseful and willing to change, but are trapped in a viscious cycle.
I have to admit, that when I am in that sex crazed 'testosterone in control' state, I no longer make rational desicions, and while I never act it out on others, I sometimes do things online or to myself that I feel deeply ashamed about - as soon as the ejaculation happens, it is like an instant switch of sanity comes on, and I feel so abased. I resolve never to do it again, as I see it as infidelity to my wife, but I fail again and again, a few times a year. So if your abuser is like that, and if he feels deep remorse, then he can potentially be worked with. He needs counseling and also probably a willing sex partner- I am fine when the wife is not ill and when I am at home and not travelling. But if not, I need to wank one out regularly for protection, so as to not stray into the darkness.
Don't blame yourself. You are obviously a desirable man, so be careful, as it is dangerous out there.