should I even bother getting in birth control?

Ka
I have PCOS, so it might benefit giving me piece of mind when ever I inevitably miss my period due to being irregular,
But I'm in a relationship with an Asexual. We have sex maybe once a month. 
We've been together for a year and a half and have only had sex a small handful of times, and we live together. 
Not trying to vent, I love him dearly and I know it's part of who he is.
I just wonder if it's even worth putting my body through the stress of hormones or painful IUDs if there's basically no risk pregnancy to even take place. 
I'd love some opinions!