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be a lech
lech 作可数名词，指好色的男人。
He is a lech.
他是个好色之徒。
好色之徒
先理解核心含义，再看它在真实句子里的用法。
好色之徒
a man with strong sexual desires
He is a lech.
他是个好色之徒。
(巨石墓的)顶石
The capstone of a cromlech.
At the wedding, a distant relative made rude comments, and everyone agreed he was a lech.
婚礼上，一位远亲说了些无礼的话，大家都认为他是个好色之徒。
The comedy sketch shows a lech who tries to chat up every woman at the party.
这个喜剧小品演了一个好色之徒，他在派对上试图和每个女人搭讪。
She did not want to sit next to that lech on the bus, so she moved to another seat.
她不想在公交车上坐在那个好色之徒旁边，于是换到了另一个座位。
lech 作可数名词，指好色的男人。
He is a lech.
他是个好色之徒。
仿照 No smoking / No parking 的“no + 动名词”结构；lech 作不及物动词，表示好色。
No leching in the office.
办公室里禁止好色行为。
Not this
He is very lech.
Use this
He is a lech.
lech 是名词，意为“好色之徒”，不是形容词；very 不能修饰名词。中文的“好色”是形容词，英语中对应的名词是 a lech，因此应改为 He is a lech。
Not this
He leches every woman he meets.
Use this
He leches after every woman he meets.
lech 作动词时是不及物动词，不能直接接宾语；要表示“对某人有好色之心”，需加介词 after（口语中也可用 over）。中文“对某人好色”的“对”在英语中体现为 after，不能说 lech someone。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
老色鬼
The manager was known as a dirty old lech who made the receptionist feel uncomfortable.
那个经理是个有名的老色鬼，让前台接待员感到不舒服。
有点好色的人
He's a bit of a lech, always staring at the waitresses.
他有点好色，老是盯着女服务员看。
臭名昭著的好色之徒
The paper exposed the senator as a notorious lech.
该报揭露这位参议员是个臭名昭著的好色之徒。
Use lech naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：L像伸出的舌头，CH像滴下的口水——lech就是好色之徒，见异性就垂涎。音近‘乐吃’，把好色当‘吃’得乐此不疲。
语域：informal 常见场景：informal conversation、slang, often humorous or disapproving 这个词常见于非正式口语：作名词时多指“好色的男人”，带贬义或戏谑；作不及物动词时指“好色、起色心”，同样是非正式用法。正式书面语中很少用到。
fetch, retch, wretch, sketch, and stretch rhyme with lech: they end in the same /-etʃ/ sound, although they are spelled with -etch. Be careful: leech looks similar but is pronounced /liːtʃ/, so it does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.