It hurt because I had approached him, cautiously, several times, and he always had an excuse. His back was bothering him, his various injuries hurt. Eventually, you stop approaching because it's not fun being rejected all the time.
When he took the medication, it caused his blood pressure to rise, he had a headache, but he'd be ready for a 2 hour marathon. Gentlemen, let me tell you, when it's been a long time, most women are not ready for marathon sex. In that, I am guilty.