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.