A survey by Tango.com, a Web-based source for love and relationships, indicated 89 percent of respondents agreed that when one or both partners in a couple has poor self-confidence, relationship problems ensue.
"Conventional wisdom holds that attraction typically begins with physical appearances," Andrea Miller, chief executive officer of YourTango, said in a statement. "We were thrilled to learn that what's on the inside is what matters most to both men and women."
Perfume/fragrance was the beauty product that made women feel the most irresistible, followed by mascara then eyeliner/eye shadow, the survey found.
"Sixty-six percent of respondents said compliments/affirmations and giving him/her your undivided attention are the best ways to instill confidence in one's partner," Miller said.
Both men and women said the top way to avoid complacency in a relationship was to try new things together, followed by, for men, having sex regularly, and for women, small gestures such as writing love notes or doing the others' chores.