I'm currently on a LTR, 3 years this next February, and I'm 18. I'm pretty proud of my relationship, and this is one girl that makes me think that the AWALT theory may be wrong for a very, very few rare cases. She does everything that I ask her to do, in a sexual and non-sexual way, and she only asks that I respect her, be truthful to her, and love her. No gifts on birthdays, no fucking anniversary day shit, it's awesome, sex is awesome, I honestly have no reason to complain, but I do have one question that I hope you guys can help me with.

I used to have some self esteem issues, and I still do, and during the relationship, I've had some cases in which other girls seemed to give me a bit more attention, and that shit was new to me. I always felt the temptation to give in, but I fought back, and decided to be honest with her. She understood, claiming that it is normal to feel attraction towards other attractive people, which does make sense.

The thing is, over the years we've been talking more and more about threesomes and open relationships, and I think I would enjoy sex with 2 girls, a FFM, but I'm not sure if I'd be capable of having another guy in the mixture, a MFM. And to add up to my "worries", a month ago or so she started feeling the same sort of attraction that I talked about to her towards some guy at her university, and I answered that it was fine, that as along as she kept faithfull to me, I'd have the same stance that she had when I talked to her, that it is normal to feel attraction towards other people.

I forgot to add that I was her first sexual partner. I had a girl suck me before, and pretty much had sex with another, even if it was a short experience.

My questions here is, what do you guys think about all this? Was my stance on this wrong, and is it even fair to request a threesome that I would enjoy but refuse one with another guy? Do you guys think that monogamy is the way to go? Or is it blue pill being open to threesomes and overall sex with different people? Should we define the rules to our relationship, or do you guys have a defined stance on this theme?