I agree with Varlin, and tho I don't recall the exact product name I've heard the term
penis in male enhancement products (infommercials after 1 AM lol, even commercials at night on SPIKE, the cable network geared to men, FX, and of course in men's ezines)
PenisEnhancement.com is taken and the word
performance may entice people more than
enhancement.
Male is the other term which makes sense (
MalePerformance.com or
MaleEnhancement.com, both taken)
End users should be your target tho 'mainers are smart, they'll see the potential and may want to own this for when the true end user arrives. Like Varlin said, it has great branding potential for products so a TM for this term will probably happen at some point. I'd say rather high $XXX for an end user but several thou for the right person who could use it as his brand and develop
Remember, the youngest boomer is now 54 or 49 depending on when you think the Baby Boom ended. Need I say more ? Huge market lol ....and many guys can't take ED products (Viagra, etc) if they have heart problems. Even Gen X members, the oldest ones have turned 53 or 48 depending on what years you take, so that potential is big lol....
Penis is frequently used for such products. I haven't seen them with cock- or dick- domains, but penis is fairly prevalent. I find it excellent for branding if you already have a solid biz around it, but hard to market as a domain alone. Very hard to appraise. If someone wants it badly and has the right biz, it can go to 6K. For a regular reseller, I don't see more than $40.