it's a lil embarrassing HELP!!!

I need a little advice..... so when me and my man are having sex (it doesn't happen all the time) but Ive been having this white clumpy discharge that come out on his penis. It has no odor. I dnt get any discharge on my panties.   I dnt have a yeast infection well I don't have any symptoms. I've  never had one so I dnt know what it feels like. And of course no stds Any ideas why??