They were unable to 'penetrate his disguise'. [=to see or realize who he really was behind his disguise]
Our eyes were unable to 'penetrate' the darkness. [=we were unable to see through the darkness]
The roots of these plants have been known to 'penetrate' to a depth of more than 15 feet.
(..) anything about blow jobs, Stu. Intercourse only. Hey, hey, blow jobs are implied. Get a better lawyer. Okay, fine. Is it all right if I penetrate you, then? I just feel so weird about all this. Well, of course it's weird. It's like riding a bicycle. I mean, once big daddy enters the rain forest, (..)2014 TvShow: Californication Title: Grace Season: 7 Episode 12