National Continence Helpline 33 00 66 Download information and resources Email your question Sign up for our newsletter. There are muscled mens having sex bones in the penis, but the tubes that fill with blood during an erection can burst. Once you master the art of contracting your pelvic floor muscles, try holding the inward squeeze for longer up to 10 seconds before relaxing. It is muscled mens having sex recommended that you do not do any exercises during this time. Men have several night-time erections On average, a healthy man has 3 to 5 erections during a full night's sleep, with each erection lasting 25 to 35 minutes. You can break your penis If the penis is violently twisted when erect, it can break.