Hello please anyone give me any advice or past experiences, tips etc. Here's the case:
Stinky has for the last 2 days had his weewillywinkie hanging out. At first I was particularly worried as it was out further than I had ever seen before, maybe an inch or more

I didnt know they were so long! I have done lots of research and read lots of really interesting and helpful forums including the one on here titled 'prolapsed penis?'. I just want a few more opinions.
Here are the details that I'm sure will help you to help me: Stinky is about 4 years old now. Recently (the last 2 weeks) he has become a ultra hyper and total kamikaze dare devil fluffy... doing mad stunts and being so energetic. He is eating heathily and drinking and his usual bright eyed chirpy self. Stinky and Whiffy are brothers and not neutered, as far as I know they have never shared with or met another sugarglider since leaving mummy fluffy. Stinky is definitely the dominant male, his gland patches are much bigger than whiffy's and he seems to be boss. Not last night but the night before I noticed his woohoo hanging out his behind and not retracting. It didnt seem to bother him, he is still weeing and pooing no problem. In fact he pays no attention to it whatsoever, no licking or flossing. It has retracted a bit and is now only hanging out a few mm but I am still worried. There is no discolouration on the fork, main bit or cloaca and it is not dry. Some sites said to put KY jelly on it, I will go get some first thing tmoro but meanwhile I put a tiny bit of vaseline on it, I hope that wont do any harm.
I have read many things with regards to what it may be; urinary infection/ dehydration/ serious prolapse/ just a horny fluffy... I hope it is the last option! Apparently this time of year they often become lil horndogs..

Anyway please give me any opinions or tips, im a worried mummy. I'll do anything for my little ones!
Thanks!