I don't give a tuppeny toss about who was doing what with whom on a personal level. Won't be the first , won't be the last.
I agree it is tittle tattle usually and I would rather it wasn't reported at times.
However!
I also think that there is an underlying reason for knowing when the two people in question can be held accountable for perhaps 'showing favour' ,' potential blackmail issues'(sadly usually if one party is withholding their sexuality), ' 'uses their relationship to seek publicity for their own self promotion whether it be in the work place, writing a book etc.'
The thing to remember is not to cast stones at one politician nor party as they will all be in the dock at sometime. People in Glass Houses scenario.