>>My male and female Cresteds are about a year and a half old. I've witnessed them mating earlier this week, which is pretty common with them.
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>>However, I noticed yesterday that the males hemipenis is still out. I think it's been out for a few days. While I know that a vet visit will probably be in order, I was wondering if anyone has ever experienced this and how they dealt with it.
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>>I would appreciate any and all experiences with this issue. Thanks.
If it's been out for a couple of days, it may have dried out, and in that situation would most likely require amputation. What I've seen recommended here before in cases like this (usually more immediately than you're describing) is to make sure to keep it moist, usually with sugar water. Beyond that, I don't know what to tell you, as I haven't experienced this before; I'm just relating what I've seen recommended here in the past. You might try the board's search function, as I know this type of issue has been discussed before.
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0.1 Albino Leopard Gecko - Tigger
0.1 Crested Gecko - Pooh-Bear