The little ones under 200 grams are the worst. They usually outgrow it by the time they're 300 grams. There are a few that remain unpredictable and strike at the drop of a hat their entire lives, though. If you're a breeder, you will no doubt meet one, one day. lol...

No, they're not affectionate. They simply do not have the hardware required for that--they do not display affection toward one another, toward their offspring, or toward humans. They are not social animals, and they don't care for their young, so they have no use for affection. Their parental care of their eggs is purely instinct-driven...while on eggs, the female simply bites and hisses at anything that disturbs her. The moment she's off them, she forgets all about it entirely. Most of my females seem confused for perhaps 5 minutes after I remove them from eggs, then they go back to essentially normal, non-breeding behavior. I have never had a single one try to strike or act defensively once I had lifted her completely off the eggs.

Trust, however--yes, they get used to us, and learn to trust that we will not harm them.