I think that sorting this out depends on three things. 

1: Russia is famous for using loyalist female agents to compromise western sources. At least that is what I get form reading western spy novels..Still where there is smoke..

2: Can we believe that 'locker room' Trump, with his feelings that women are just objects he has access to from being rich would NOT take any opportunity he is presented??

3: Why is he not just admitting it. As he says, he could walk down the street and shoot someone and not lose a single voter. Answer. Melania Trump. Donald could lose a LOT of money in a divorce settlement 'for infidelity.