Perhaps there was an age of innocence on the Internet, though that's hard to imagine. The Web site www.myfirsttime.com may offer some proof. When it was initially launched in the late 1990s, anonymous contributors flocked to the site to post accounts of their inaugural sexual encounters. The site is still up, though it seems to be a lot more porny than in days of yore, when playwright Ken Davenport culled its entries for comic, absurd, touching and tragic tales. He created the off-Broadway hit My First Time, in which four actors dramatize some of the most memorable stories. FourFront Theatre recently staged Davenport's musical Altar Boyz. Its version of My First Time runs through August 30 at Le Chat Noir.