Party time last night

I was invited to one of my friend's 40th birthday party last night and had a really good fun evening - lovely to see a lot of my friends there last night, and nice to see Di and Terry there too (thank you for the drinks Terry).
What I find increasingly strange is why men do not like to get up and dance though - all night long it was just the women who were dancing (except for one guy, who kept at the fringes).  Answers on a postcard to:- ............... (or just use the comments box below, it might be easier lol)