Pissing in the sink? Do you guys really do that?

I was browsing around the internet and came across [this article] (http://www.slate.com/articles/life/dear_prudence/2011/12/dear_prudence_my_father_doesn_t_want_me_to_find_his_biological_family_.single.html) on slate where a woman is asking for help dealing with her husband's habit of pissing in sinks. The lady answering then states that this apparently isn't all too uncommon. And now I'm totally disgusted by the opposite sex.

So, seriously guys, do you do this? Why? I realize piss is fairly sterile, but I think it people should be safe to assume the sinks they wash their faces and mouths in haven't been pissed in...