Hang on, what do you mean by 'prostitute kids'? Or was that a typo?
I was contemplating just answering 'Am I?' to the post but that may yield a 'no one liner slap'.
A few years back there was a british or American game show about the participant being hooked up to a lie detector and asked the most personal questions. If he passes all, he would get loads of money. Needless to say, it usually degenerates to 'have you ever had an affair', or 'did you cheat on your girlfriend', etc. It was ugly. Quite a few shows you could see the spouse (both sexes), gf/bf storm away when the contestant hesitates or fail the lie detector. The ramifications of the show extends beyond the studio. When I watched it with my ex-wife, she suddenly looked at me and asked, "have you cheated on me"? To which I replied with all the years of POW training, "NO, have you?". The conversation continued and I told her, this is stupid, don't ask questions that you might not like the answers to. She was puzzled and of course upset but there was no fall out from there.
Sometimes the best defense is an offence. Ask the question back, throw them out of balance. I've been on the receiving end of lies as well. Gfs, lied, covered the fact that other men were involved, etc. Unfortunately I learnt from experience.
The number one rule is DENY at all cost, if they can't prove it, it is just a suspicion. Only your own guilt can give yourself away.
Next, fight back. Say how ridiculous it is to suspect you and you are utterly hurt by the distrust and accusation. Walk away or dump the gf for a while, she'll be sorry and reconcile.
Hang on, the NUMBER ONE rule is DESTROY ALL EVIDENCE!!! Don't keep stuff for 'trophies' or memories. Somehow, somewhere, sometime, these will emerge and nip you in the butt. I am a repeat offender of this. My #2 gf contacted me after almost 20 years. Then started to rekindle the flame. Texted me some raunchy texts and I kept it, only to be seen by a current gf....
Next, during a recent separation with my fiancee for about 8 months, I had my own romps and took some photos of a few nice encounters. I deleted them but left them in the 'recycle bin' on my desktop. She didn't look at them until we were looking at some old porn and then I 'undeleted' one of the deleted porn. Suddenly she started to scroll through the recycle bin and I was caught....
So..... make sure you clean up your sh!t. Remember, there are undelete software out there both for computers and phones. There are stealth tracking software that she can install on your phone. Taking photos can have metainfo that link you to the location. emails sent from anywhere has IP address to pin you (e.g. SZ compared to HK).
Off topic... now back to yours!