I think you need to slow down, and take stock of your situation. The least of your worries right now are what sex your snakes are. You should be paying attention to properly housing and caring for these animals before wasting money on them being sexed, as there is no way these snakes could be bred for years.
Take that 52$ and apply it to another set up. Get them both happily housed.
BTW, if you see them 'cuddling' its not ok, and its not cute, they are (in a snake way) trying to assert dominance. What if you have a regurge, how will you know what snake it is? What if you end up with mites in both? or parasites in both? And it will be both, as there was no quarentine.
Sorry. Look...all I'm saying is you do not seem to be focused on the REAL issue, which is NOT the sex of the snakes.
You know where the vet is, who the vet is, and how much it will cost. Now you can go whenever you want, once everything else is taken care of.
THANK GOODNESS no issues yet, what do you want to see before doing something about it? injury? sickness? death? why wait when almost all of those things WILL happen if you leave them together? (there may be some positive accounts of people keeping snakes together, but its in pretty special conditions).
You should be focused on the home front first. That money is best spent else ware.