Verbseoul.
하다 verb (adj)
야하다yahadato be lewd, to be NSFW

To say to be lewd, to be NSFW politely in the present tense, use 야해요 (yah-hae-yoh). Below is the full conjugation of 야하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
야해
yah-hae
야해요
yah-hae-yoh
야합니다
yah-hahm-nee-dah
Past
야했어
yah-hae-ssuh
야했어요
yah-hae-ssuh-yoh
야했습니다
yah-hae-sseum-nee-dah
Future
야할 거야
yah-hahl- -guh-yah
야할 거예요
yah-hahl- -guh-yae-yoh
야할 겁니다
yah-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
야하세요
yah-hah-sae-yoh
Suggestion / Let's Polite (요)
야해요
yah-hae-yoh
Question Polite (요)
야해요?
yah-hae-yoh-?
Connective “and” — (고)
야하고
yah-hah-goh
Conditional “if” — (면)
야하면
yah-hah-myuhn
Noun form — (기)
야함
yah-hahm