The way i see it, and im just using my past experiences, any snake can become a lil lover. The Emerald Tree Boa i use to watch over, i knew him since he was 2 months old. And although i had to withstand several dozen bites, he became very eager to be picked up and held. I even put together a little baby sack for him, it would lay right above your chest and he would be placed in there and walk round the property.
I guess patience and alot of confidence that itll work is whats needed.
Are females naturally more aggressive than males? As a general rule of thumb.