Clear sperm?!

I've never actually seen it but my fiance tells me that it's White but every time he ejaculated inside of me and I go to wipe off the excess between my thighs it's clear I even stuck my finger and one time and nothing white was on my finger it was clear. Could he be infertile, should I ask him? Well I already have before we started TTC and he said no. Could the color mean anything?