Another guy

I LOVE my boyfriend with all that is within me. I have NEVER cheated in my life. Never dreamed of doing so. But I have a really good buddy of mine that is just really attractive. Honestly.. To put it bluntly... If i were single, Id fuck him. I WOULD NOT date him though. So it's just a sexual attraction. 
Is it normal to sometimes fantasize about others as long as it is not carried out??