And what is wrong with the crocodile or even the giraffe?? As long as you don't have skid mark's then you should be OK in most thing's. That is if they haven't gone a dirty shade of grey instead of being white.....
I don't think that wearing sexy undies would impress the only female in my life. A bowl of tuna seems far more likely to make her purr with satisfaction ;-)
(For what it's worth, my undies are all boxer shorts, purchased from the 'value' ranges at Tesco or Asda. If I wore anything else I'd probably get some very odd looks from the ladies who do my service washes at the laundrette!).