TLDR: it appeals to our nature. 

 All male instincts are based upon threat recognition and confrontation/egress

And sex 

 They don’t get risk mitigation whatsoever

(bc many women are risk fetishists) 

 Exactly 

 Backing in makes sense. It's not only easier, there's also mechanical considerations like what-if-I-need-a-jumpstart. 

 This is why women get in all sorts of fender benders and accidents like that, because they would prefer TO BACK OUT OF THEIR PARKING SPOT AT WAL MART DURING A BUSY TIME OF THE DAY AND THEY CAN'T/WON'T LOOK AROUND 

 you sheathe your blade slowly, so you can draw it quickly