Dirty Talk

My husband is the only guy I have had sex with. Granted, I have no personal experience basis for comparison, but he seems large. Sometimes I have to tell him to hold back a bit due to his size. The thing is...he has asked me to say that I have slept with guys that have bigger or better cocks and seems to enjoy that sort of talk while having sex. I want to give him what he likes, but feel dumb and awkward and am not really sure what to say or how to sound sexy saying it. Any tips?