This is for all of you who hold onto the staunch belief that science is boring and is kept behind the walls of laboratories and between the covers of dry, boring textbooks; all of you who think science is exclusively practiced by mad scientists in white lab coats, or simply is a bunch of facts and equations that you are forced to memorize, and a category of classes in school that you are supposed to fail because it is foreign, difficult to understand, and to do well in it would label you a nerd.
If you are in this crowd, please stop. You're insulting science.
Judging from the number of users I see experiencing pregnancy scares on the Scarleteen message boards, particularly from situations besides genital intercourse, you’d think sperm cells were some magical weapon of mass fertilization, powerfully wiggling their way through clothes/towels/fabric, and leaping off hands to impregnate every person around them within a 50 mile radius. Look out for scary sperm! Get outta the way! They're coming right for you! (pun intended)
As a volunteer for Scarleteen, I'm here to tell you none of this is physically possible. It just isn't. As a former laboratory technician at a fertility clinic, having worked directly with sperm and semen (and without having ever gotten pregnant doing so, no less!), I want to tell you why.