Threesome

Okay guys, so me and my boyfriend of almost 3 years have been talking about wanting to have a threesome for the passed like year... the problem is we don’t know how to find someone to have one with.

Can you guys please give me any tips on how to find someone to have one with and how to keep the relationship with my boyfriend and the girl we have a threesome with “normal”. Oh and also any tips or information on what it’s like to have a threesome would be greatly appreciated too😁