Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
Penis is regular. It follows the -es Addition rule.
Use plural verbs: "The penises are ready" (not "is ready").
Yes. The plural penises is standard across all English variants.
The word penis follows the standard English pluralization rule. When forming the plural, penis becomes penises. This follows the -es Addition pattern, which is one of the most common plural rules in English.
Understanding why penis becomes penises helps with spelling and pronunciation. Nouns ending in -s, -x, -z, -ch, or -sh add -es to form the plural. This makes the word easier to pronounce.
When using penises in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The penises are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.