No… but it’s ALSO not common for a pair of women to walk up to a random, average guy and say, “Wanna have a threesome?”
In my case, I’m a 49 year old, flabby married guy. Why are two women asking ME for a threesome? Sounds suspicious.
Well, I am surprised by the results here. I would have thought the opportunity to try something so seldom experienced would have led more fellows to throw caution to the wind. I may have to reconsider my views on male sexuality. We’re not ALL led around solely by our dicks. Who knew?
this IS the Straight Dope… nice to know you guys are using your brains to think with!
a better class of gentlemen all around 
Gawd! Are they seriously not even going to buy me a drink first? Chat me up a little? Flirt around and be fun? None of that, just ‘Hi. Come fuck me and my friend here’- apropos of nothing?!? No way.
But I doubt I could be talked into a threesome with any approach.
Hey, I love sex, just as I love money. But no matter how much I love money, alarm bells go off in my head when someone says, “I’m the former Prime Minister of Nigeria, and have I got an opportunity for you!”
It’s no different when a stranger (or pair of strangers) comes along and offers to have sex with me. I’m just too realistic! There’s no way on Earth that a guy like me is the man of their dreams. SOMETHING would have to be mighty fishy.
No way they’re looking for me. This is fishier than a japanese fish market.
I was around a few single straight men recently and took a mini-survey. Two said they would run like hell, as pressing business was awaiting them elsewhere. One said he would tell the ladies his wife wouldn’t let him have a threesome. And one said he would ask the ladies if they could swing by to pick up his babymamma and make it a foursome.
I would image it’s extremely uncommon. However, two women randomly approaching a dude in a bar for a threesome is also extremely uncommon. That’s why it would likely set off alarm bells.
“Pull the other one, ladies, it’s got bells on.”
Murdered? I dunno.
Robbed? Yes. Hasn’t happened to me, but I know plenty of guys who hooked up with a lady and the next morning or later that night found their wallet missing.
Here is Exhibit A as to why this is not a good idea.
http://www.syracuse.com/news/index.ssf/2010/01/syracuse_man_charged_in_motel.html
I said yes, based on the fact that it is two average women as in of the whole population and not of bar-hoppers, thus meaning no serious STDs, decent health condition, moderate measurements, and so on. Also, the average woman would thus not be wanting to mug you.
This is why you need to go clubbing with a wingman.
Literally, I mean a commissioned officer following from a close distance who can make a gun-kill if someone gets on your six.
If i were single i would def consider it… Solve one issue… get a hotel room. Another hint… if they tell you to get into the shower first… take your pants with you. Nothing is funnier than answering a call and a guy is standing their with no clothes because he left his clothes and hopped into the shower!!!
C’mon guys… this cut murder thing?? I think too many people are watching Tru-Tv?? Chances are greater that your ability to perform might be more of a factor than felony assault.
The addadge “sounds too good to be true, it probably is” applies here. Most women I think like most men would rather do this sort of thing with friends they know some what. I’d stay clear.
Threesomes are over rated though. Been there, done that , bought the t-shirt.
I voted yes on general principles but of course it is more complicated. I have a finely tuned bullshit detector so if I felt that something was wrong I would back out.
If the OP is asking if I would be interested in a random threesome with two average looking women, then yes. Sure. If the question is about the circumstances (it could be a set up, etc) then probably not. I thought the gist of the OP was whether it sounded appealing, not whether it sounded safe.