According to Ms. Lewinsky, she performed oral sex on the President but he never performed oral sex on her. This makes sense, he could throw his back out with a wild tongue motion. That the President is a healthy male. Some people may think lying under oath about a tryst is as serious as using government operatives to burglarize an office. Sorry if I disagree.
Some puritans think it is an impeachable offense.
I don't think it is, unless it turns out he was having an inappropriate relationship with Barney Frank, then I say impeach.