sex isn't good anymore. (no rude/judgmental comments)

my bf and i have been together for almost two years on the 26th. im a little taken back by how our sex life is. it totally sucks right now.. i love him very much and the only thing about our relationship that's going downhill is the sex. im not into toys and he isn't either.. i don't want to tell him that im not satisfied because that would really hurt his feelings. he takes much pride in his "sex game". but then again.. it might just be me. i noticed he doesn't get a full hard on for me anymore. which makes me insecure. i don't want to sound uneducated about the female body but is my vagina just getting loose?  i don't know. any advice?