Toxic Bachelors by Danielle Steel (Very good, 2005, HC, 594 pgs, Delacorte Press Large print)

Dust jacket, cover and pages have some wear; pages are unmarked. ISBN 0739460609

The story follows three wealthy, commitment-phobic best friends who are forced to confront their relationship fears when they fall in love.  The story centers on Charlie Harrington, a perfectionist philanthropist; Adam Weiss, a celebrity lawyer who prefers short-term flings; and Gray Hawk, an artist drawn to damaged women, as they spend their annual Mediterranean yacht vacation. 

During the trip and their return to New York, each man encounters a woman who challenges his deepest terrors: Charlie dates a social worker uncomfortable with his wealth, Adam falls for a smart young woman with a secret life, and Gray becomes devoted to a successful mother. Ultimately, the trio must overcome their past wounds and phobias to embrace long-term commitment, transforming their carefree bachelor lifestyle into happy marriages