A few more T-shirt ideas. Not practical, but these would be funny as T-shirts in cartoons, with onlookers showing the appropriate reactions.

Three t-shirts with text only:

Kick my crotch--see if I care

I dig life as a spade

It's impossible to castrate me

cartoon of a bombardier in the bomb bay of an aircraft, holding a scissors just above his crotch and yelling, "Balls away!"

No testy additives in this body.

I think the eunuch symbol should be made from the male symbol since eunuchs are made from men:

the male symbol with the arrow curving downward to represent impotence

and

the circle being dashed rather than solid to represent the missing balls

or

the circle with a diagonal slash through it as in the international road sign for "no"

or

perhaps the circle both slashed and dashed

Not quite perfect, but here’s a commercially available T-shirt with a puzzled looking squirrel asking, “Have you seen my nuts?”

http://www.whatonearthcatalog.com/cgi-b ... em=AY6772T

How about just:

Uniquely

Eunuch