Sadly more info is needed on the nature of the problem. Why was he unable to "get it in?" Was it a size issue, him being too big or too small to fit (or likewise, she being too big or small)? Was he having trouble maintaining an erection? Was it just simple anxiety about the thought of putting it in?
I will watch this question to see if you add any info, but sadly there's nothing anyone can say with what you have provided.