Verbseoul.
하다 verb (adj)
섹시하다seksihadato be sexy

To say to be sexy politely in the present tense, use 섹시해요 (saeg-shee-hae-yoh). Below is the full conjugation of 섹시하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
섹시해
saeg-shee-hae
섹시해요
saeg-shee-hae-yoh
섹시합니다
saeg-shee-hahm-nee-dah
Past
섹시했어
saeg-shee-hae-ssuh
섹시했어요
saeg-shee-hae-ssuh-yoh
섹시했습니다
saeg-shee-hae-sseum-nee-dah
Future
섹시할 거야
saeg-shee-hahl- -guh-yah
섹시할 거예요
saeg-shee-hahl- -guh-yae-yoh
섹시할 겁니다
saeg-shee-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
섹시하세요
saeg-shee-hah-sae-yoh
Suggestion / Let's Polite (요)
섹시해요
saeg-shee-hae-yoh
Question Polite (요)
섹시해요?
saeg-shee-hae-yoh-?
Connective “and” — (고)
섹시하고
saeg-shee-hah-goh
Conditional “if” — (면)
섹시하면
saeg-shee-hah-myuhn
Noun form — (기)
섹시함
saeg-shee-hahm