Ines First, if wearing a belt is going to be useful, the wearer cannot have access to the keys or a way to unlock. Otherwise they would simply remove it to have sex or masturbate or the attacker would insist they unlock. So, no belt should be easy to remove quickly.
I will assure you, that the firemen or the emergency room staff can have one off in minutes if necessary. But realistically how many medical emergencies require access to the genitals. Maybe that 4 hour erection that one gets sometimes from Viagra. I see this stuff about needing access to an emergency key but that would just give the wearer an easy access to an orgasm.
Yeah, I will probably get kicked off of this site but please get real if you are going to do this.
