Does sex hurt the first time? Your questions answered Swipe through to learn the main reasons why penetrative sex can hurt, from tension and lack of lubrication to infections and pelvic floor issues. You'll also get simple tips on what can Pain during sex is common, but that doesn't mean it's normal. Many women silently tolerate discomfort because they think maybe my body is like this or it'll get better with time. But Why Does It Hurt After Not Having Sex for a Long Time?