Male BBL - differences between male and female patients?

There are important differences between male buttock and female buttock aesthetics. The most obvious one is that males don't want to look any wider on the anterior posterior view. They just want to have more rounded projection. Your individual preferences may differ, and you may want to discuss your surgery with a surgeon who is experienced in male buttock aesthetics.

It doesn’t have to look feminine, no. More square and muscular shaped buttocks is achievable with a Brazilian Butt Lift.

Having done so many of each, this is more dependent upon the individual goals.  You are right that the goal to be achieved is usually different, and you may not need fat from the abdomen, flanks, and back transferred to the hips. Muscularity is actually an advantage, as the greater the muscularity of the glutes the more highly vascularized tissue there is around the fat grafts.  As long as you maintain the same amount of body fat after the surgery, the buttock will remain improved long term.   Kenneth Hughes, MD, Board Certified Plastic SurgeonLos Angeles, CA