I have two neutered males, they’ve not changed their personalities.
His love affair with your leg could go on a couple of weeks – a month (I’ve read 8 weeks somewhere) after neutering, but then the hormones will subsceed and your leg will probably be just another human leg again, not a sexy bunny girl. My bunny Bam fell in love with my German Shepherd and he kept it up for 2 weeks after his neuter, then lost interest in her all togeather. He never sprayed urine, not all bunnies do, but my other one was a sprayer and it’s incredible how high up the pee can reach. You don’t want that, so have your boy neutered soon.
One of mine I had to feed pellet-slur with a syringe the day after his neuter, the other one started eating the minute he came home. Same clinic, same vet, same meds and all, just two different rabbits. Both bunnies were fine in a couple of days, as if nothing had happened.