Well.......that article could certainly incite some spousal rage. Equating ###ual infidelity with financial infidelity is wrong, unless you're talking about improvident depletions or fraudulent conveyances to family, friends, girlfriend or boyfriend or the financial maintenance of girlfriend or boyfriend on the side in order to shift marital assets elsewhere to the benefit of one spouse, but not the other.
If ADK purchases a rifle unbeknownst to his spouse, she still maintains an interest in that rifle as a marital asset. If you want to reach that far, a spouse's failure to have ### on a regular basis or in accordance with the other spouse's expectations, squandering their body from their spouse could be construed as infidelity. How about unfairly manipulating a spouse into providing resources at their personal expense for the future well-being of the other or other's children?
IMO, any spouse that would divorce because the other spouse failed to inform the other of their purchase is just looking for an excuse. Why delay the inevitable?