Dude is clearly having a midlife crisis at the moment. That's really it, the only noteworthy part is that he is having his while being a somewhat popular figure online. He's getting attention from women who are having their own midlife crises and retarded fans who would happily suck is cock and pay for the privilege.
There's a good chance he and his wife end up in devoice when the novelty of this new found sexually liberation wears off or one of them pushes (or get caught) the boundaries a little too far.
The age Nick is currently at is a real minefield for men. Most men go through their teens and early twenties horny as all hell and you either choose between having one sexual partner and being tied down or 'in a relationship', or playing the field -- and for most of us, getting nowhere near as many women as we think we deserve.
Mid to late twenties, you bite the bullet, finally accept that if you really want regular sex, you're going to have to have that relationship. So you get married or start living together. Maybe have a couple of kids. Your partner is exhausted from taking care of the kids, so despite having settled down, and limited yourself to one partner, you still aren't getting all the sex you think you deserve.
Mid thirties to early forties, something peculiar happens. You've achieved some success in your career, so you've got some spare money. You've shaken off that awkwardness of your youth and you've achieved a degree of confidence. And there are hoardes of desperate women -- all those women who never got around to having a long term relationship because they thought their career was more important. All those women who did have a long term relationship but their partners just dumped them for a younger model.
Even if you exclude those women with children from consideration, you've reached a point in your life when -- as long as you're clean, solvent and presentable -- and really, any two out of those three will be adequate -- those hoardes of desperate women will start launching themselves in your direction. And sure, they'll have relationships as their long-term end-goal, but these are all women who've been around the block. They know what the game is and how it's played. Married men in their mid-thirties and upwards aren't waiting for sex. If you want their attention, you've got to put out.
Lots of men find the temptation under those circumstances just way too much to handle. Those really hot women who wouldn't look at you when you were twenty years younger are all desperate to get you into bed now that you're forty. And you don't have to limit yourself to women your own age. It seems younger women find you irresistable as well. You're already married with a couple of kids, so you obviously aren't a commitment-phobe and these eggs aren't getting any younger.
And all this is true for ordinary guys. You don't need some kind of celebrity status to be subject to these pressures. If you have any kind of social life or work in a mixed workplace, chances are you're going to have to deal with it at some point. Given that, it's not at all surprising to me that Nick's finding himself a bit shook by the number of wine moms desperate for his attention.