How to sex?

I've got a friend of mine, just got into the hobby of herps, but he lives about 4 hours away from me and he hasn't the slightest idea how to sex, but he buys reptiles based on what the seller tells him because of his inexperience - I'm afraid he may have gotted ripped off by receiving males instead of females he thought he purchased. If there is no one in his area that actually has access to probes and knows how to do it, is there anything on the net that can actually show him how to probe or pop? For the safety of the snake, I don't think there is such a website, except through secondary sexing techniques like spurs and tail lengths... but, what's the possibility the people (mostly over the net) who sold him those snakes are completely honest? These are people who have been inquired about on the BOI, he's familiar with the forum's BOI feature and he mostly reads about them, and seldom posts. Please help.

Dr. Mark Seward has a great video on sexing snakes. It's relatively inexpensive, and a great way to learn if you don't have anyone to show you.

A qualified herp vet may be able to instruct you.

And VPI has a pretty good writeup here: http://www.vpi.com/9VPITipsAndTechs/...exOfSnakes.htm

Yup I agree on that one..

Not knowing where he lives, we can't recommend an actual place or person to help him. If he lives in, or near a herp store with a decent herp collection, they may be willing to show him how to sex snakes, or they may charge a small fee and sex them for him.