Leopard geckos and odd behavior?

Question
Hello. A quick bit of info before i just jump right into the question:  I am a very proud owner of two leopard geckos. One of which is female, her name is vivace and as her name states she is VERY lively and lively in italian is vivace, hence the name. haha. okay, moving on. . . I also own another leopard gecko named halo, he is named for his yellowness from him being a leucistic gecko. i have owned the female for 6months and the male for 11 months.

QUESTION: the geckos seem to be displaying this ehaior that i havent noticed before., they have been licking there "behinds". this may sound odd, cause it certainly does to me, but i checked there vents and its all clear with no discharge puffiness etc. vivace randomly does this but now halo has catched on to tjis it seems. . . is this at all normal?!?

PLEASE HELP ASAP!. . .if you could could you PLEASE send a copy to Xxeffin libraxX@aol.com thank you soooo much have a nice day.

Answer
Hi Angelica,
Wow! That is odd for sure... one thing that comes to mind is possibly parasites. I would take a fecal sample into the vet to have it checked.  If they are housed together, if one has parasites, chances are, both have them.
Even though you may not see anything there, they may itch if parasites are present. You may also want to make sure there is no stuck shed, which may be a little harder to see.  What may help IF it is a shed, would be a warm  bath..not very deep..just enough to cover their underside.
Something else that comes to mind is your substrate.  If you are using sand or some other course substrate, it may irritate their vent area, again , not to the point that it would be visable. Sand, especially can get into the vent and cause an irritation.
Hope these ideas help!! I would surely have the fecal done as that is the most likely cause.

Please give me an update after the fecal..or if you decide its one of the other things I mentioned.