With its open encouragement of adultery and its tagline “Life is short, have an affair,” website AshleyMadison.com has already scuttled one planned offering of its shares. Over the weekend, hackers said they captured sensitive data — names, addresses, sexual proclivities, and more — about millions of AshleyMadison customers. While Avid Life Media Inc., the Toronto company that owns the site, may have the data breach under control, analysts say the hack exposed the vulnerabilities of the business.