Is my new boyfriend so horny coz of my large breasts?

Ok..I'm new to sexual relationships. I'm a 21yr old fmale. Basically this is my first bfriend. I'm not superskinny, I'm 5ft 9 and a UK size 10 dress size. all my life i've been plagued by mean staring at my breasts. They are a very full 34G cup size and i know this probably turns alot of men on. Its just the way they are. Anyhow, basically i'm lucky in that i can get excited from just having my breasts massaged . Anyway, my point is this. My new bf and I are having sex twice or three times per day and I'm wondering is this excessive? I mean i enjoy it and am really horny alot of the time but he loves me on top and i actually love it doggie. However, hes basically h..d most of the time and he says my big boobs do it for him...basically is our sex life normal and are guys generally very horny around big breasts?