I have a feeling this will be much ado about nothing. Yeah, Trump probably had sex with a porn star 10 years ago, but not many people will care. His prior womanizing is not exactly a new revelation.
Years ago, this may have been an issue. I remember when Reagan was the first divorced president, it was somewhat scandalous. But as our mores have deteriorated, having affairs with adult women seems now rather tame.
I do think character matters. And Trump is lacking in personal integrity. But in the real world we have to play with the cards we are dealt. And despite his flaws, Trump is our best option at the moment.