My 2 cents as someone who saves intimacy for someone I am truly in love with...maybe you shouldn't be having sex with someone if you are kind of split between two women? I mean, sure, it feels great, but I doubt it is doing anything for your long term outlook except make things more confusing.
For me, interests are king. If I can't play video games or watch anime with my girlfriend, I'm sorry, but that is a strong no. Things might be fine for the couple dates, but it is the times when you are bumming around doing nothing that is important. I wouldn't want to be with someone that, when you are hanging out on a Sunday afternoon with no plans, you feel like you can't do anything with them.