A threeway with escorts, never appealed to me, bloody hate condoms at the best of times, usually too tight and awkward to get on, most ladies just tell me to do it but I know they are essential obviously when having sex with a stranger that you don't know the sexual history of.
I'm not just taking about escorts, a lot of guys don't realise that it's probably more risky having casual sex with a girl you pick up than it is with an escort IMO.
The reason for that outburst is I've heard with Duo's you've to swap the condom each time you want to switch ladies, nightmare territory for me, I'd loose my erection with all the chopping and changing and the virgin mary herself wouldn't get me hard again..