I didn't realize condoms came in different sizes until I went to a drugstore to buy a few. I just assumed they were "one size fits all", but apparently some men require a larger circumference for a comfortable fit. I mostly use lambskin condoms, because I don't like the feel or smell of latex rubber.
My partner is on birth control, so we don't use spermicidal condoms very often. I think she may have had an allergic reaction to one years ago, so she's not going to insist I use one, anyway.