Trial Offer: Rent three adult DVDs free for 10 days when you join the URentDVDs club. The trial begins the day you create your account. You also can choose a free adult DVD every three months as long as you remain a member (it's yours to keep). URentDVD offers free 15- to 30-second online previews of most films, as well as instant downloads at its partner video-on-demand site. It sells used titles starting at $9.99 each. Monthly fee: $19.99 to have up to three DVDs out at a time, $24.99 for four, $29.99 for six or $39.99 for eight. Relative size of selection: 4 of 4 stars. DVDs ship from: California. Restrictions: Does not ship to certain zip codes. Click here for a list. Shipping costs: Included (site provides pre-paid mailers to return DVDs). Credit cards accepted: Visa, Mastercard, American Express, Discover or payment by automatic check if you provide bank account number. Sales tax: None. Privacy policy: Does not sell or rent customer data to third parties without permission. Customer service: 800-591-9844 or email. Open to: U.S. residents.

Download Movies Instead of Renting: If you prefer to watch movies instantly on your computer rather than waiting for a DVD to arrive by mail, visit Adult VOD Pod to compare services. VOD stands for video-on-demand. Purchase credits to view DVD-quality adult movies online or play a flat fee (typically $4.95 to $14.95) to download movies that can be viewed for a set period of time (e.g., 24 hours, a week, 30 days). Some sites, such as Video Box, charge a set monthly fee (in this case, $9.95 per month) for unlimited access to its entire catalog. Others, such as Hot Movies, sell access by the minute or per download.

Up to 75% off Adult DVDs: If you're looking for bargains and selection, we suggest Movies by Mail, which offers new customers a free movie when you pay $4.95 shipping, as well as discount codes (see site), XRent DVD, which sells ex-rental titles from $4.50 each or Overstock DVD and Adult DVD Empire, each of which have many clearance titles and offer free shipping on every order.

Video Gold Adult DVD Club: Choose two adult DVDs for $5.95 each plus shipping when you join the Video Gold Adult DVD Club from Adam & Eve. You'll also be able to choose a third adult DVD free. As a member, you must purchase two more DVDs at regular club prices within a year. Or purchase a fourth DVD when you sign up for $19.95 and buy just one additional DVD within a year. Open to: Residents of the U.S. and Canada.

Search for Sex Books: Browse the list of sex book bestsellers at Amazon.com, including The Adult Video News Guide to the 500 Greatest Adult Videos of All Time.