After reading some of the questions, I’ve become afraid that I could eventually be arrested on suspicion of prostitution, so I’d like to withdraw my membership.

As long as the law doesn’t change, you won’t be arrested as long as you follow the rules here. But if you’re worried, you can simply leave the club. There would be no benefit to the club in showing male members photos of women after they’ve left, so I don’t think they would do that. They have plenty of female members, and the club only makes money when male members view registered women and make offers.

Of course. The club wouldn’t show male members the profile of someone who has left or isn’t a member. I think you should ask the club to delete your account and raise the issue with them when you do. Earlier, you asked as though you hadn’t joined yet, but this time you’re asking as though you’re a female member. I don’t know whether you’re actually a member, but if you are, I recommend contacting the club to cancel your membership immediately after reading this answer and resolving the situation you’re concerned about. Goodbye.