[lftl]

He's talking about tracing your male lineage. So if you just follow the male side of your family tree -- your father, his father, his father, his father, etc. Everyone one of these men by definition had a son.

[RC_ITR]

Sure, and every parent had a child. Just weird to gender it.

[BitwiseFool]

I gendered it because I am male. If I were female I would write how I would be the first in a direct line not to have a daughter.

[somehnguy]

It isn't weird to gender it, I think you still don't understand what they are saying.

[ectopod]

Who mentioned gender? He's talking, very literally, about sex.