peeringintoafestivevoid this was my first thought too.
That actually, the age of consent only applies in the way most people assume for girls. If the boy had consenting sex with the woman and she had become pregnant then this would be considered legal.
(But if the woman had been under 16 then it would be considered illegal still.)
A little backwards maybe, maybe not. It could open all sort of debates. I think it's much more common for younger girls to have older boyfriends than for boys under 16 to have older girlfriends though.
But I do remember that when I was 16 (not tooooooo long ago. Ok, well a while then) thinking that the legislation was strange with seemingly double standards