Feel for you, bro.
When the wife doesn't tell her husband about the tramp stamp, it means her mind is elsewhere already.
Send HER packing. She wants to play sorority girl, have her do it away from your kids. We all know what's the mentality/mindset of the lower-back "Tramp Stamp". You know it, I know it, she knows it and all her friends know it.
Whatever you do, DO NOT kiss her A$$ and bend to her will. She doesn't respect you now, she will respect you even less later if you go "OK, honey."
Don't play 'insecure macho-boy'. Play it cool and have her hit the bricks. Throw her out if you have to. There is no room in a marriage for that kind of BS.
Just be sure to have your 'womanese-to-english' dictionary handy when she start to spill the BS about how she 'needs to find herself' or how she 'needs her own space' or how you 'don't meet her emotional needs'.
Been there, dude. Dating only foreign women now, and LOVING IT!!!!!!!!!!!!!!!!!!

imp:
American women get their head filled so full of BS on a DAILY basis from 'the View' Oprah, etc, that it is impossible for them to stay grounded in reality.
Her mind is elsewhere and she'll twist things in that typical woman brain of hers that she will convice herself that it is YOUR FAULT she needs to "find herself".
I've heard stories like these a hundred times before. They are always the same.
Don't EVER believe a woman's words. It is only her actions that count. Only actions, remember that! Words are meaningless babble out of a woman's pie hole. If she is "In to you", her actions will show that.
Women operate by feelings and emotions, not written or spoken words. Feelings.
If her feelings for you are positive her actions will be positive. If her feelings for you are 'distant' she will ACT distant from you. It is unavoidable. It is how they are programmed. It only matters how a woman ACTS towards you...not her words.
Get yourself a pre-paid legal plan NOW. Costs about $100-$150/month and will strengthen your position, because in the back of your brain, you won't be worried about the financial cost of the divorce proceedings, if it heads that way. Trust me on this.
Would you stay with your wife if it wasn't for the kids, after this stunt?
Didn't think so. Go get yourself a pre-paid legal plan.
Good luck. PM me if you want to rap. Feel for you, bro.