In this case the MP referred to is female - the unknown in a lot of these allegations is whether people in power used that power to get what they wanted in which case they need to be dealt with, are they opening themselves up to blackmail or as you say if it is entirely consensual whats it got to do with anyone else
I think we need to be very, very careful here.
If illegal acts have been committed, of course they must be fully investigated, but as a society we are generally agreed that sexual acts that take place between consenting adults are acceptable.
It becomes a lot more complicated when you try to go beyond what is legal or illegal and start moralising about said acts. Yes dirty old men try to sleep with attractive young women (and boys), but some attractive young women (and boys) have also been known to sleep with the boss to try to get ahead.
It becomes even more difficult when you’re dealing with a tidal wave or “he said she said” type allegations about events that (may or may not have) happened years ago. It’s impossible to prove a negative and, sadly, many of the allegations in that spreadsheet smack much more of moral disapproval than a suggestion of anything illegal.