Your problem sounds a little strange but it may not be his fault, if I were you, I'd take him to a doctor and get him checked up, also try having sex 3 or 4 times a week (or less, just not every night - to build temptation and arousal). Also try talking about it with him and find out what really he really likes (no matter how weird it may be) just tell him to trust you and you should be fine.
If worse comes to worse, there is always Viagra but definitely check with the doctor first.
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