Ha ha yes, a previous GF (am married these days) she was 19 I was 28. We were going at it like hammer and tong. I started getting a bit light headed and there was no way I was stopping. It was a good session!! Anyway I start to shake and sweat which killed the mood for me, but she wanted to carry on to completion, I felt like a dirty sweaty old man. Funny but not.
Anyway I always have Lucozade tablets next to bed.