They are absolutely necessary... especially those who give blowjobs... I have found that men prefer a blowjob to fucking a pussy or an ass... My wife is almost revered... once Those who test their service come almost every week....
I would like even if it is a client of my wife's to make her work that hard.... the average cum in five minutes and the majority in less.... There was one that lasted a lot but when we moved three years ago he didn't come further.