Donald Trump and his wife have been underpaying and exploiting women for years in their various business schemes. It's a known fact that at Trump University, female professors were paid 47% of the salary that male professors made. Now, you can quibble over whether the commission formula was inherently sexist or if it just conveniently worked out that way. But females working at the Trump Foundation made a paltry 38% of what men made, one of the widest gender pay gaps of any multi-level marketing company in the United States.
It is not remarkable whether Ivanka cheats on him, because Donald Trump has been committing adultery his entire married life, accruing a laundry list of sexually transmitted infections, including some you've never even heard of.