Magic Mike vs. Jamie Dornan -- All Out Ab Warfare ... Horny Chicks Win (TMZ TV)

In one corner ... “50 Shades of Grey" stud Jamie Dornan flaunting his chiseled muscles -- and in the other ... Channing Tatum and Joe Manganiello showing off everything in "Magic Mike XXL."

Women everywhere (and 10% of men, according to Kinsey) agree ... there are no losers in this battle.