Probably not.
Threesomes can actually be a great way to explore who you really are. It's pretty common for couples wanting to spice things up in the bedroom to invite someone else.
As for your question, I'm straight too, so I can understand your hesitation. I haven't been in that situation, but I think it really depends on your comfort level and boundaries. It's all about what feels right for you in the moment.
If you're looking to explore more without the emotional complications, I found a site at https://villideitti.net. It's like a sex club where you can easily find a date just for sex, no strings attached. Might be worth checking out if you're interested.
Yes I would without a doubt, especially if my wife really wanted to. I would do most anything to keep her sexually satisfied and if she wanted to experience two cocks, I would not have a problem with that. I would want some input as to who the other guy would be. Preferably it would be someone who was also open to some bi activity as it would be the perfect opportunity to let my wife in on this aspect of my sexual desires and hopefully see her get really turned on by it as well.