Don't laugh, but sometimes you have to forget all dignity and lay on the floor beside them to see what the problem is. If he is aroused sufficiently, then it could be positional. Hence the floor-laying. Sometimes a folded towel for him to stand on helps.
I keep both the male and female in harnesses so that I have a "handle" on them and can control their position and give the boy a lift if he needs it.
Finally, I did have a breeding female who had a blockage and could not be bred.
PM me if I can help any further. Good luck.
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