Riddle Me This? The Phone Call and The Granny Gown...

The Granny Gown: Enemy of Intimacy
Over the past few years, I've run this scenario past a few guys. Most of them could relate, but none knew the answer. So allow me to put it out there:

You have been dating or involved with this lady for quite some time. You're having one of those late night chats  where she reveals that she's in her bed, butt naked.

Okay, so let's fast forward to the night or the weekend where she's staying at your house or you're staying at hers. The night has been romantic and steamy and now it's time to retire to the bedroom. You come to bed properly attired (or sans attired) but she comes to bed in a t-shirt and shorts or sweats or the ubiquitous granny night gown. Mind you, the temperature is about 10 degrees warmer than the night of the phone conversation.

Now, a few nights have passed, you're back on the phone with her and, again she tells you that she's in bed completely naked. Then, she wonders why this news leaves you not only un-impressed but even slightly annoyed. Talk about a day late and a dollar short!

Any answers to this???