Aristotle, Historia Animaliam 1.15
“Below the penis there are two testicles. There is skin around them called a scrotum. The testicles are not the same as flesh nor are they far from it. Later, will will speak more precisely about what their nature is and generally about all these kinds of parts.”
τοῦ δ᾿ αἰδοίου ὑποκάτω ὄρχεις δύο. τὸ δὲ πέριξ δέρμα, ὃ καλεῖται ὄσχεος. οἱ δ᾿ ὄρχεις οὔτε ταὐτὸ σαρκὶ οὔτε πόρρω σαρκός· ὃν τρόπον δ᾿ ἔχουσιν, ὕστερον δι᾿ ἀκριβείας λεχθήσεται καθόλου περὶ πάντων τῶν τοιούτων μορίων.
Plutarch, Natural Phenomena 917D
“Or is Aristotle’s claim true too, that Homer calls khlounês the boar who only has one testicle? For he claims that the testicles of most of the boars get crushed when they scratch themselves on trees.”
Ἢ καὶ τὸ λεγόμενον ὑπ᾿ Ἀριστοτέλους ἀληθές ἐστιν, ὅτι “χλούνην” Ὅμηρος ὠνόμασε σῦν τὸν μόνορχιν; τῶν γὰρ πλείστων φησὶ προσκνωμένων τοῖς στελέχεσι θρύπτεσθαι τοὺς ὄρχεις.
173 Etym. Gen. lambda 34
“Long-balls”: this means having big testicles. Aristokrates was mocked thus.”
λαπιδόρχας· ὁ μεγάλους ὄρχεις ἔχων. Ἀριστοκράτης δὲ οὕτω διεβάλλετο.
Aristotle, Problems 879a-b
4.23 “Why does rigidity and increase happen to the penis? Is it for two reasons? First, is it because that weight develops on the bottom of the testicles, raising it—for the testicles are like a fulcrum? And is it because the veins become full of breath [pneuma]? Or does the mass become bigger because of an increase in moisture or some change in position or from the development of moisture itself? Extremely large things are raised less when the wight of the fulcrum is far away.”
Διὰ τί ἡ σύντασις γίνεται τοῦ αἰδοίου καὶ ἡ αὔξησις; ἢ διὰ δύο, διά τε τὸ βάρος ἐπιγίνεσθαι ἐν τῷ ὄπισθεν τῶν ὄρχεων αἴρεσθαι (ὑπομόχλιον γὰρ οἱ ὄρχεις γίνονται) καὶ διὰ τὸ πνεύματος πληροῦσθαι τοὺς πόρους; ἢ τοῦ ὑγροῦ αὐξανομένου καὶ μεθισταμένου ἢ ἐξ ὑγροῦ γινομένου ὁ ὄγκος | μείζων γίνεται; τὰ λίαν δὲ μεγάλα ἧττον αἴρεται διὰ τὸ πορρωτέρω τὸ βάρος τοῦ ὑπομοχλίου γίνεσθαι.
Pliny the Elder, Natural History 28.215
“They say that a goat’s dung is good for you with honey or vinegar, or just butter by itself. Testicular swelling can be treated with veal suet mixed with soda, or by the calf’s dung reduced in vinegar.”
fimum etiam prodesse cum melle dicunt aut cum aceto et per se butyrum. testium tumor sebo vituli addito nitro cohibetur vel fimo eiusdem ex aceto decocto.

This is a truly important post.
I remember that back in the 90’s, wrestlers used to accuse each other of lacking “testicular fortitude.”
In the early 60’s we sang a ditty during long school bus rides that went, in part:
“Do your balls hang low,
do they swing to and fro,
can you tie them in a knot
can you tie them in a bow,
can you throw them oer your shoulder
like a military soldier,
do your balls hang low?”