Sexual frustration and guilt

For context, my partner is asexual (gray-ace i think) and I am a person who is often horny. At first, in our relationship we were very sexually active, though after they came out to me, we stopped doing as frequently- it became a sparse activity. I didnt mind, I understood and this was a middle-ground I was completely willing to be in, understandably. I wish to cater to their needs, though recently it has become too sparse, and every “break” is longer and longer. It’s becoming unbearable and my urges feel disregarded. We only really do it when theyre in the mood, regardless, so its already as rare as it gets, but I wish we would do something- anything! Doesnt have to be intercourse. Though I dont want to confront them in case they feel bad or obligated due to the way that they experience sexual feelings.

I just dont know if this is a pot worth stirring, if its inconsiderate and selfish of me, or is it something that is somewhat alright to talk about.