Biggest Loser Couples

I’ve been watching the Biggest Loser Couples. Same as before just couples as teams. I think this is an improvement. I think they might have gotten the idea from the twins in last seasons. They had each other at the ranch and at home. They had the buddy system which really helps in weight loss. I’m kinda frustrated at the fact only men have won Biggest Loser. I’m thinking there might be physical differences between the sexes that might make it unfair to have the two running together. I think the next biggest loser should be women only or teams based on sex.