Zyxel

The stork is the bird that brings the baby, but a swallow's the one to prevent it.

A professor was giving a lecture on involuntary muscular contractions to his first-year medical students. Realizing that this was not the most riveting subject, he decided to lighten the mood. He pointed to a young woman in the front row and asked, "Do you know what your <deleted> is doing while you're having an orgasm?" She replied, "He's probably playing golf with his friends."

A minor misspelling, this might attract the wrong crowd.