Susan Sarandon, as she was about 25 years ago.
Mmmmm . . . . John Gilbert, Errol Flynn, John Barrymore–in their pre-fucked-up prime, that is.
John Gilbert: http://www.johngilbert.org/thepreacherintheblacksilkrobeisreadyforweb.jpg
Errol Flynn: http://redcarpetvictim.com/wp-content/uploads/errol-flynn.jpg
John Barrymore: http://cdn.things-and-other-stuff.com/wp-content/gallery/barrymores-drews/john-barrymore-1903-burr-mcintosh.jpg
Do porn starlets count? Because I imagine I could have learned a lot really quickly from any of them.
Charlize Theron(any age from 18 to now). Gorgeous, smart, sexy, sensitive, adventurous, funny.
Raul Julia
So sad that he died at age 54.
Raquel Welch could have had me any time during the late 60’s, up until around 1974. Hell, she could have me tomorrow but even she can’t get my virginity back.
Hrm…at the time I was looking to lose it, at 16, I was looking for someone who would be fun and straightforward about it, not super-romantic OR super-kinky. So in 1983 that might have been…
Yep. Put me in with Harrison Ford, lol. Was already crushing on him from American Graffiti; Return of the Jedi just added to the bonus.
Tom Selleck, even now, but if he was in his Magnum prime then the Cosmic Being could sell tickets for all I would care.
Barbara Eden.Those firm, ripe apple tits spoke to my adolescent libido from 1965 to 1970.
Zooey Deschanel, and I’m free this weekend.
I guess it would be Nicholas Cage.
I would lose my virginity to Louise Brooks, circa 1929, as many times as it took until I got it right.
Too many to list. I’ll just stick with the Irish ones: Christine (The Moose) McGlade ca. 1983, Jean-Louisa Kelly ca. 1995, and Elinor Donahue ca. 1957.
Jane Seymour circa 1973.
Nathan Fillion
Though if I were a man it’d be Audrey. watching Breakfast at Tiffany’s right now!
Raquel Welch and Barbara Eden are way up on the list, but I flashed instantly to Caroline Munro. Not only a Bond Girl (who dies, on-screen, in a stupid way) (BTW, happy to learn she’s still alive and signing autographs!) but she had a fairly major role in Golden Voyage of Sinbad, one of my guilty favorites.
Ah, adolescent lust! If we could harness that power, we could cut off our petroleum imports immediately!
ETA: it’s not too late… I am still a virgin!
I dunno about now, but, back then I certainly wanted it to be Susan Anton.
Kate Beckinsale. Or Jan Smithers back in the day. Or Olivia Wilde.
Geez!
Mick Jagger. Oh, my.
Only if the celebrity agrees to marry me first! 
Not in a million years will that ever happen. 