Oh cool, I get to perpetuate comparisons between penises and cars.
Basically agreeing with the others who have gone before, there's a great line in an obscure 1976 Gus Trikonis movie, which goes: "My boyfriend can go from 2 to 7 in 10 seconds, if you know what I mean". General approval from all present in the scene follows.
While 'showers' get to bulge out, the big difference that 'growers' can demonstrate is always going to be visually and sensually striking, imho.
