My male roommate who I barely speak to asked me for sex

LITERALLY OUT OF NOWHERE. What the fuck, I feel so disgusting and like I can’t even be comfortable in my own house. He’s done weird stuff before like touch my tattoo without asking and asking me to scratch his shoulders at like 3 am, but I just blamed that on him drinking every day. He stays in his room and LOUDLY fucks his incredibly annoying girlfriend Diane all day and night. Then I asked if he’s cool with me watching my friend’s dog and this was his reply. Yuck.