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.

Before I continue, a few things I'd like to clarify:

• For the duration and purpose of this piece, I'll be using the terms "male" to indicate a human patient with a functional penis and "female" to mean a human patient with a functional u...

What's charting? It's a person taking and keeping notes about their menstrual and fertility cycles. Those notes may be as little information as what days you get your period, may have more information, like what kind of flow you had and what discharges you experienced that month, or have just about anything and everything you can think of that does or may have something to do with your fertility cycle: your basal temperatures (a vaginal temp you take daily with a thermometer made for that purpose), your libido, your sleep patterns, the whole works. What information you include depends on what you want to observe, and what your needs in charting are.

When you hear about people charting their periods or overall fertility cycles, it's usually either about trying to conceive or using natural family planning (NFP or FAM) as a primary method of birth control. Many of you are not trying to conceive, and for younger people, NFP isn't a sound sole or primary method for you either because your ...