it is a moderate possibility, but all it takes is the right wind direction at the right time, and even if it blows away from the other plants, it can still be in the air and possibly blow back towards the females. I still wouldn't take chances.
you could even get pollen on your clothes from checking on the male then get it on your girls. males are usually the bigger ones. then they stretch real tall in bloom so their pollen can travel further without hitting the ground. i would chop him down he's virtually useless. any signs of the girls flowering yet? if they dont decide to flower soon you might get some 5 footer's or more. but this isnt a bad thing. good luck man.
Hey dude been checking out your grow. Looking good, I think that the leaves falling off is over water try to let the soil dry out a bit before you water again. Cant wait to see those big fat colas!!! Stick your finger at least a inch into the soil if the tip of your finger is wet or real moist dont water!
Nice bro. I didn't realize how sativa they were. I figured they were sativa, but that one on the right looks a little more sativa than I thought. Definitely nothing like a colombian..but maybe more like a Durban. Solid plants, che'lu.