It's been a while since I read this particular one but it was about a business guy who all of a sudden becomes irresistible to women for a reason I can't remember. I don't recall much else except for a motorcycle sex scene, lesbian 69ing, aphrodisiacs, and weird stuff with his brother that might've led to a threesome. If anyone knows the title I'd be forever thankful

It might be Coneco by Tamaki Nozomu or one of his other works but I'm not sure.