Christians... Was Paul a prude?

I've been reading the gospel of Thomas lately. Now, I cannot imagine Jesus letting the devil hang around him for so long.. so Thomas must have been a pretty fly guy. Seems to be by his scriptures... take this one for instance:

Thomas 37: His disciples said: On what day will you be revealed to us, and on what day shall we see you? Jesus said: When you unclothe yourselves and are not ashamed, and take your garments and lay them beneath your feet like the little children (and) trample on them, then [you will see] the Son of the Living One, and you will not be afraid.

Now.... I can fully appreciate this sentiment. There's nothing much better than hanging around in your birthday suit on a sunny day at the beach.... Thomas rocks!! So...

What's up with Paul? What was he so ashamed of?