Yeah, that seems to be the case with most Indos.
In my opinion, they are one of the more attractive blue tongues...I've never understood why they aren't CB more often..
Also, just wondering how you came to know the sex of your BTS?
I always assume mine if female, because s/he seems small in comparison to pictures of known male Indos that I have seen, and the underside of the base of her/his tail is very firm.. (apparently due to lack of hemipenes) Buuuut, thats just me taking a wild guess lol I wish they were more sexually dimorphic!