Trial offer: Receive 10 minutes free when you create a new account at Yappo (formerly Best Movies). Rental fees: $4.83 for 25 minutes, $8.11 for 50 minutes, $12.60 for 90 minutes, $14.52 for 120 minutes, $28.84 for 280 minutes, $38.82 for 420 minutes, $53.94 for 620 minutes, $68.86 for 850 minutes. You can also download titles for $7.95 for seven days or $14.95 for 30 days. Relative size of selection: 4 of 4 stars. Technical requirements: Windows Media Player. Credit cards accepted: Visa, Mastercard (billed as Paycom or CCBill). You also may pay by check or phone. Privacy policy: May sell or rent your information to third parties (see privacy policy). Customer service: Email via site.

Best Adult VOD Site?: The most popular VOD service in our guide is Hot Movies, which has tens of thousands of adult titles. You can buy access by the minute (at 8 cents and up) or purchase unlimited viewing of any individual title for two, seven or 30 days. Our most popular flat-rate site is Video Box, which charges $9.95 per month for unlimited downloads from its library of more than 3,000 movies.

Prefer to Rent DVDs?: If you prefer to rent DVDs rather than download movies, compare online services at our Adult DVD Rental Guide. Most charge $10 to $30 per month to have one to three adult DVDs out at a time, with no late fees or return dates. A few rent individual DVDs for $3 to $5 each per week. A credit card is required to join any DVD rental service.

Discount 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, Overstock DVD, which offers clearance titles and free shipping, or Wanted List, which offers 10 percent off any $25+ purchase with the code ADULTDVD10%OFF or free shipping with 5PORNSHIP.

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.