I too am kind of curious of what words are actually being said in those ads that makes it 'vulgar'.
The trouble with things related to sex is that sex is a VERY popular pastime in the world we live in and many both desire and demand it.
As the demand is there, there will always be those that will cater to them, hence the ads.
As the rpgers have won the right to advertise their events in the game, the caterers of things sexual will use that to push their 'ware's' so to speak as 'Role Play experiences'.
And the fact that there are more of them than ever now tells us that these clubs and events are VERY popular, otherwise people probably wouldn't be doing them. ;-)
So yeah, it is NOT going away anytime soon short of another ad ban by SE.