Sorry man... being a bloke you have something called (medically) a "cascade"... where as soon as ONE organ is tripped ... they ALL function as designed.
The prostate is the crux... once the prostrate is stimulated? Even DEAD you would stil have an orgasm. It's called "milking the prostate". It sets off an UNSTOPPABLE biochemical reaction. Literally. Not even death can stop it. For apx 36 hours. Post death. Once those Chems trip your prostrate? Ejact.
Orgasm (male AND female) as well as various levels of 'arousal' is NORMAL with sexual assault. Self preservation, those are DELICATE tissues. Zero lube resulting in tearing resulting in death level of survival.
Yes. It can be a headf*ck LATER, thanks to certain religionsbut? HOPEFULLY that's not you.With little to no forgiveness & empathy & understanding.
An orgasm? Does NOT mean you "liked" it. It means you had a healthy body.