Verbseoul.
하다 verb
섹스하다sekseuhadato have sex

To say to have sex politely in the present tense, use 섹스해요 (saeg-sseu-hae-yoh). Below is the full conjugation of 섹스하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
섹스해
saeg-sseu-hae
섹스해요
saeg-sseu-hae-yoh
섹스합니다
saeg-sseu-hahm-nee-dah
Past
섹스했어
saeg-sseu-hae-ssuh
섹스했어요
saeg-sseu-hae-ssuh-yoh
섹스했습니다
saeg-sseu-hae-sseum-nee-dah
Future
섹스할 거야
saeg-sseu-hahl- -guh-yah
섹스할 거예요
saeg-sseu-hahl- -guh-yae-yoh
섹스할 겁니다
saeg-sseu-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
섹스하세요
saeg-sseu-hah-sae-yoh
Suggestion / Let's Polite (요)
섹스해요
saeg-sseu-hae-yoh
Question Polite (요)
섹스해요?
saeg-sseu-hae-yoh-?
Connective “and” — (고)
섹스하고
saeg-sseu-hah-goh
Conditional “if” — (면)
섹스하면
saeg-sseu-hah-myuhn
Noun form — (기)
섹스함
saeg-sseu-hahm