Buds with seeds still burn, you do want to remove the seed first, and if the weed is good enuf maybe plant them. Could also make hash, etc..
As for where the pollen may have came from, it is air born, and can travel 2000+ miles to find the right girl. It can be in your hair, on your cloths, or maybe you had some hermie flowers on one you missed (they can hide well). IF they came from a hermie, they would be female seed but also carry the hermie into the seed. IF they came from the boy down the road 50/50 male/female.