Welcome to BB! How lovely that you have two rabbits. What a party that must be. I’ll address both separately…
1) Male – Some rabbits do not like being pet by humans. That’s a fact. Some rabbits may take years to warm up and allow even a 2-minute pet session. That’s also a fact. So your make may simply be a rabbit that doesn’t enjoy human interaction. While that may be saddening, it’s in his nature as a pretty animal to not enjoy interactions with predators. Although there are many rabbits that love being pet and cuddle, there are actually many more that don’t like it. Respect your male rabbit’s boundaries, and he’ll love you for that.
2) You need to provide feedback when nipping/biting is too hard. Like puppies and play biting, animals need feedback to know how hard is too hard. A rabbit will not perceive it hurt a human unless the human indicates so. A standard method is to make a high pitch squeal and retract that body part away. Do this any time a nibble is too hard, and this feedback will help her gauge how light or hard she can nibble.
Generally speaking, even rabbits who may enjoy human interaction are not 24/7 lap dogs, so be sure to give your rabbits space and only pet when they ask you.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.