He did say it. I heard him talk about having it off with a girl up a mountain, and it being so cold he wanted her to hold onto his bum to warm it up.
He also said that the next day when he saw her he was too embarrassed to speak to her, so he ignored her.
It's plausible, but I don't buy it.
Edit: and also... this thread should be called "Glyn - shags the girls then ignores them"