Not a pick-up line as such, and I don’t advise anyone doing this under most circumstances

I sent her a dick pic

It wasn’t an opener, we’d been chatting, and she asked for it

We already had a spark, and were flirting for a while

I stress, this was solicited, and I even sent her a link to a picture, rather than dropping it in her DMs, so she could still control whether or not she saw it

Anyhoo, it worked

We’re engaged now