Lilla I don't think they have a clue really, men. DH always wanted to be at the birth and read up on it but he had no idea.
He complained I was hurting his hand by squeezing it too hard. 
When I was pushing, he said ' I could see him but you've sucked him back up Lu'.
When DS was born, he said 'He's covered in gunky stuff, is that right?', then whispered to me 'He's got really big balls Lu'.
The midwife told him it was because of my female hormones affecting a baby boy and that they go down in the first few days/weeks. He looked disappointed, I think he thought it was to do with him.
He was great and really supportive but he didn't have a clue. At one point, after he got over the initial panic about being at the hospital, and we were in the delivery auite and settled ad I was walking aound alot, he asked if I wanted to 'do a quiz' he'd found on his ipad to see who had the best historical knowledge. I was about 7 cms by then and told him to bog off.
He had a snooze not long after that and when he woke up said 'I needed that, it's been a long night'. You don't say DH!
He also offered me a ham sandwich when I was fully dilated- as he sorted through his picnic bag. I am a vegetarian.