Verbseoul.
하다 verb
씹하다ssiphadato fuck, to copulate

To say to fuck, to copulate politely in the present tense, use 씹해요 (shee-pae-yoh). Below is the full conjugation of 씹하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
씹해
shee-pae
씹해요
shee-pae-yoh
씹합니다
shee-pahm-nee-dah
Past
씹했어
shee-pae-ssuh
씹했어요
shee-pae-ssuh-yoh
씹했습니다
shee-pae-sseum-nee-dah
Future
씹할 거야
shee-pahl- -guh-yah
씹할 거예요
shee-pahl- -guh-yae-yoh
씹할 겁니다
shee-pahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
씹하세요
shee-pah-sae-yoh
Suggestion / Let's Polite (요)
씹해요
shee-pae-yoh
Question Polite (요)
씹해요?
shee-pae-yoh-?
Connective “and” — (고)
씹하고
shee-pah-goh
Conditional “if” — (면)
씹하면
shee-pah-myuhn
Noun form — (기)
씹함
shee-pahm