Hehe - what a funny topic!
Well for me it was very nerve racking on this 'Special' day when it was my turn to come up with the goods
My wife was in a room of her own which had a toilet and on the day the nurse came in handed me TWO jars and asked me to produce the first errr what can I say

first spurt in the 1st jar and the rest in the 2nd. I seriously went into panic mode and the colour of my face drained to a pure sickly white! I was like how can I aim it so quick into each one and what if miss the jars lol

Looking back now it was quite comical!
Anyway the nurse handed me this folder which had magazines in it and said you can go in the toilet here in the room if you like and put a Do Not Disturb sign on our room door and walked out. All I will say is at this point my wife and I looked at each other and she gave me a really big grin! Lets just say with the missus around it turned out to be very easy
The same scenario happened on the next 4 attempts and on our 5th IVF attempt I was actually marched to a room which was the size of a cupboard and thankfully it had some videos and magazines!
Next door from this room was also a kids play room for the ward and I am glad that the nurse did not get mixed up and lock in me that room or I would have been stuck in a room with Tweenie videos and Noddy books!
In conclusion tell him not to worry and despite the fact your nervous you overcome those on the day with ease. Each time up to egg collection we stopped intercourse 2 weeks prior to this and believe me that helped a great deal too!
Hope this helps and sorry I was a tad too graphic
Phil