Throwaway because I dont know how to talk to my partners about this right now ...

Me and both of my girlfriends have been incredibly sexually compatible and intimate in the past but recently it just doesnt happen as often - and I dont really know how to bring it up again or how to ask for sex without feeling like im begging for it. Its been weeks since one of my girlfriends has engaged or mentioned wanting to be sexual, and the other hasnt made any engagements and seems to blow off a lot of my advances for about a year now- or gf1 will come in and take over my advancement and we'll both touch on gf2 and it doesnt go anywhere. We all live in the same apartment and sleep in the same bedroom, I'm generally really happy with them, making food, cleaning, etc... but it just feels like no one wants to fuck me. The biggest intimate improvement has been that I get spooned or cuddled a bit more..

I know this is a communication issue, I know we need to talk.... but how? Whats a good way to bring this up without sounding jealous, or bitter, or resentful - or should I mention that I am upset and how its been making me sad. I feel like I'm going to start an argument or rift between us just because I feel left out.