• Been dating a cancer guy for 2 years, things are good but its been an emotional rollercoaster to say the least, I've done my best to settle in to the issues but I'm curious if this is a cancer guy thing as I've experienced in with the last 2 cancer guys I've dated. Its a touchy subject but i really hope to get honest open answers from other cancer men. My boyfriend has an issue over thinking during sex and losing his erection. Has this happened to other men?