A term used to describe men who cook, taking the household chore part away from it, and turning it more into a hobby, used to impress friends and prospective partners. More and more, women are finding a partner's ability to cook as important as other attractive features (looks, personality, status, income, etc.)
My friend Pat hosts large dinner parties at least once a month. He makes fancy tapas and serves them with wine he paired himself. What a gastrosexual!
Gordon Ramsay is a gastrosexual.