Hmmm.... not too many uses and yet still diverse for it's penis/sexual uses.
You could market it well, very well, by targeting:
1) penis enlargement (pills, devices)
but also
2) Sexual Stamina (lasting longer) sell an ebook, membership site, with private label herbals, sexual/fitness exercises, etc. tips, tricks, community, board, etc.
Even though #1 is obvious & sticks out (pun intended) I can see you marketing #2 above and placing ads for Longer.com in mainstream publications like Maxim, Rolling Stone, Men's Fitness, Men's health, etc...
or do both.
Even t-shirts with just the word: LONGER would be a great conversation starter. Very nice domain, and good luck.
if you start an affiliate program, please put everyone underneath my referral code.
.