Is it normal that my husband masturbates and ejaculates on our bed when I’m not home?

Hi everyone. I (35F) have a question that’s been bothering me, and I’d appreciate some outside perspectives. My husband (36M) occasionally masturbates when I’m not home — which I know is totally normal and fine. What I find concerning is that he does it in our bed and doesn’t clean up afterward. I’ve come home a few times to find visible stains or sheets that clearly haven’t been changed.

I haven’t brought it up yet because I don’t want to make him feel ashamed or attacked. I fully respect his privacy and his autonomy, but it does make me uncomfortable that he leaves the bed messy, especially since it’s a shared space.

Is this kind of behavior something others have experienced? Am I overreacting by feeling grossed out or disrespected by it? How should I bring it up in a constructive way?