That was my first assumption on reading the title, but the article mentions two other things:
The male-gene bias apparently persisted for subsequent generations after the initial human/Neanderthal pairing: male children of mixed ancestry had more offspring than their female siblings
In Neanderthal communities, the bias was reversed (i.e., more human DNA was retained in the X-chromosome female line.)
That was my first assumption on reading the title, but the article mentions two other things:
The male-gene bias apparently persisted for subsequent generations after the initial human/Neanderthal pairing: male children of mixed ancestry had more offspring than their female siblings
In Neanderthal communities, the bias was reversed (i.e., more human DNA was retained in the X-chromosome female line.)