In reguards to sexing snakes there are only 2 ways to do so & both are accurate. If you want to include visual sexing there are 3 ways but visual sexing is not accurate, unless you see actual copulation between 2 snakes or egg laying taking place then it is very accurate in the case of eggs or seeing the males hemipenes inserted into the female during sex. Other than that it is not accurate at all IMHO.
Probing usually works best & males probe considerably deeper than females. There are occassions where they will probe "in the middle" but usually by probabing both sides an accurate decision can be made. Most cases Colubrids its like "night & day" as the males generally probe way deeper, but you do get the odd 1 thats hard to tell. It is very difficult to probe younger snakes & must only be done by someone with experience doing so or the snake can be harmed. Adults can be harmed as well if not done properly.
The other method of sexing is "popping" & it is only generally done with baby snakes. "popping" is the manual inversion of the hemipenes (if the snake is a male) or the lack of in the case of a female. If the snake "pops" male it is 1000% a male as girls do not have hemipenes. "popping" is not always accurate for determining females as it is difficult to get the hemipenes to "pop" in some cases. Just because you didn't see them doesn't mean they are not there (in some cases anyway). If you see them there is zero doubt. Again snakes can be injured if not done properly by an experienced hand.
In reguards to a Boa for a TV shoot you are asking in the wrong place for starters as this is the General Colubrid Forum & Boas are Boids not Colubrids. Try posting in the Boa forums or the General Forum & you will get more responses as the people in the Boa forums usually have Boas & those in the Colubrid forums have Colubrids
Mark
__________________
Mark's GONE SNAKEE! working with select Colubrids (Corns, GB Kings, EIs) and Woma Pythons
All stock parasite free and established on F/T prey. No PMs please email at
gonesnakee@shaw.ca