Because men urinate everywhere and it's a way to Make it look clean for the next 2 days untill we get the wonderful duty of cleaning the darn stains off again! It's either that or a cork! It never gets old....
I think maybe you should give this guy a break for a second... He's probably embarrassed he knows you know and he would know that your not stupid to believe him. If you want this relationship to work maybe discuss that there is obviously a sex issue and talk about other ways to revamp it, bring in a tickler? you need to get out of your comfort zones. I surprise my husband with naughty night away when grandma can babysit and believe me I do this for him more than me but a guy need sex to feel loved and a girl needs hugs to feel loved... I bet he still hugs you? give and take.... And I'm not a "do it all for your man" girl either! good luck mate what ever you do though...