growing up in the 50's and 60's, like many other guys my age, I had several.  Hard to pick just one, but Marilyn Monroe would probably be my fave.  Somehow, I got hold of a copy of her Playboy centerfold picture.  Sadly, when I left for college, it stayed in its hiding place in my bedroom (under the seat cushion of my chair).  I suppose my mom found it and disposed of it before I came home for my first Christmas break. sigh.....

LLAP,
Swim

sigh..

Caroline Munro ( Golden Voyage of Sinbad), my first
Jenny Agutter ( Logan's Run) , my second crush
Farrah Fawcett - sigh, that poster and smile.....

 
Now:
Nigella Lawson
Monica Bellucci
Keira Knightley

Raoul bova

I think most celebrities sucks lol  
But  
Raoul bova  
Will suck lol
Cc

Skin-tight Batsuit, long red hair, and a body to die for.  I always wanted to use my Bat Tool on her!!

Shirley Jones

Ever since I laid eyes on him in Titanic.. LOL

Alyssa Milano

But after I saw Stand My Me on vid wayyyyy after it came out I went through a huge River Phoenix phase even though he was long dead.  eom

Phoebe Cates

Olivia Newton John

celebrity

For me, Molly Ringwald

Bewitched

Elizabeth Montgomery as Samantha while levitating was a re-occurring dream as young horny teen.

https://i.pinimg.com/originals/4a/66/fb/4a66fb28a2352ad75e33b94b95bb269f.jpg

Sophia Loren #1 by a large margin, Raquel Welch,  a lustful #2 ..... so many choices, and great thread question, so I'll go with Joey Heatherton #3 as a perennial starlet.  Honorable memory goes to Linda Lovelace.

May need a cold shower tonight.

Not exactly a childhood crush but from .18-25 I was Seriously in love with her lyrics and her voice.

Raquel Welsh too.  What a pair they would be together.