“Put some/something/the fun between your legs” is a cycling saying that has been printed on many images. “Put something fun between your legs” was printed in a 1972 newspaper, when it referred to a Yamaha motorcycle. “Put Some Fun Between Your Legs (this shirt includes a likeness of a racing bicycle)” was printed in a 1977 newspaper.
 
“Put the fun between your legs!”: The Politics and Counterculture of the Bicycle was the title of a 2005 Ph.D. thesis by Zachary Mooradian Furness.
   
 
18 June 1972, San Antonio (TX) Express, pg. 58, col. 8 classified ad:
Put something fun between your legs—1970 Yamaha 200 twin electric, $450.
 
8 September 1977, The Press (Binghamton, NY), “Now try this one on for size: The T-shirt is suddenly chic” by Jason Thomas (Chicago Sun-Times Service), pg. 1B, col. 2:
Now, The Competition, a T-shirt store has several dozen T-shirts in its windows proclaiming everything from “Sexy Bitch” to “I Can Make It Hard for You” to “Spoiled Rotten” to “Every Inch A Woman” to “Put Some Fun Between Your Legs (this shirt includes a likeness of a racing bicycle.)”
 
10 November 1977, The Daily Tar Heel (University of North Carolina, Chapel Hill, NC), “Personal,” pg. 2, col. 6 classified ad:
GET SOME FUN BETWEEN YOUR LEGS at/from TUMBLEWEED CYCLERY in sunny downtown Carrboro. 152 East Main Street.
     
Google Books
New York
Volume 11
1978
Pg. 65:
PUT SOME FUN BETWEEN YOUR LEGS Everyone knows you’re Bicycling for the Fun of it.
 
Google Books
Cue: The Weekly Magazine of New York Life
1978
Pg. 39:
For tennis enthusiasts, there’s “Takes Balls to Play Tennis”; for bikers, “Put Some Fun Between Your Legs”; ...
 
Google Books
The Truth about Peter Harley
By James Mills
New York, NY: Dutton
1979
Pg. 64:
I put my head in the door and saw a man about Harley’s age, tall and lanky, standing behind a desk in jeans and a yellow T-shirt with a drawing of a bicycle and the words “Put a little fun between your legs.”
   
19 December 1980, The Arizona Republic (Phoenix, AZ), “The two-wheel trail: Different spokes for different folks” by Peter Rose, pg. D9, col. 2:
Bedecked in helmets, snug in toe-clips, styled by striped or leather tops (Friesner’s top, also worn by other and adorned with the association logo, reads, “Put some fun between your legs”), the hard-core riders cut loose for Desert View.
 
Google Books
Staking Claims
By Page Edwards
Marion Boyars Publishers Ltd.
2000
Pg. 95:
She wore shorts and a t-shirt which had ‘Put Some Fun Between Your Legs’ written across the front.
 
OCLC WorldCat record
“Put the fun between your legs!” : the politics and counterculture of the bicycle
Author: Zachary Mooradian Furness
Publisher: 2006.
Dissertation: Ph. D. University of Pittsburgh 2005
Edition/Format:   Thesis/dissertation : Thesis/dissertation : Manuscript : Microfiche   Archival Material : English
   
(Trademark)
Word Mark PUT THE FUN BETWEEN YOUR LEGS
Goods and Services IC 016. US 002 005 022 023 029 037 038 050. G & S: Merchandise, namely, bumper stickers. FIRST USE: 19980605. FIRST USE IN COMMERCE: 19980605
IC 025. US 022 039. G & S: Merchandise, namely, tee-shirts and sweatshirts. FIRST USE: 19980605. FIRST USE IN COMMERCE: 19980605
Standard Characters Claimed
Mark Drawing Code (4) STANDARD CHARACTER MARK
Serial Number 86628936
Filing Date May 13, 2015
Current Basis 1A
Original Filing Basis 1A
Published for Opposition April 19, 2016
Registration Number 4991305
Registration Date July 5, 2016
Owner (REGISTRANT) Biel, Joseph INDIVIDUAL UNITED STATES 2752 N Williams Ave Portland OREGON 97227
Type of Mark TRADEMARK
Register PRINCIPAL
Live/Dead Indicator LIVE