。
She likes being looked at by men.
Literal
She [topic-は] men [by-に] be-looked-at [nominalizer-の] [subject-が] is-liked.
The whole passive verb phrase 男性に見られる ('be looked at by men') is nominalized with の and treated as the が-marked subject of 好きだ ('is liked'). 好き belongs to the special class of stative predicates that mark their object with が (not を) — like 嫌い, 怖い, 上手. Note also that に here marks the agent of the passive verb, which is the standard structure: パッシブ+に+agent.