My Mistress uses a sound on my cock and it doesn't leave any lingering pain, but she is very careful. The first time I ever had my cock fkd was with a birthday candle. Now that hurt afterwards! It hurt to cum even several days later, but you're not going to do any damage to yourself if you do cum.
I suggest that you refrain from this sort of experimentation, curious though you may be. nh is correct, it can easily lead to a UTI, or worse. being a registered nurse, and having spent the best part of a several decades working in ERs I can unfortunately attest to the dire results of such "playfulness."
By the way: well and clearly put, nh!
