###Human: Why is there increased sensitivity and pain during erection and sex? ###Assistant: Hi. Pain at the tip during erection can be due to: 1. Tight frenulum: this is skin fold at the tip on the lower side of the foreskin. This needs a frenuloplasty. 2. Partial phimosis: this prevents retraction of the foreskin during intercourse and may cause pain, especially seen in diabetics. It may require circumcision. 3. Peyronie's disease: hardening of penile tissue with pain on erection. This starts with pain and ends in hard plaque felt in penis near tip or shaft or base. 4. Rarely Raynaud's phenomenon. In this, there is also a pain in hands and toes, especially when exposed to cold.  I think in your case since you have not mentioned about foreskin issues, it may be early Peyronie's disease. Taking small doses of Sildenafil or Tadalafil helps. You can take 5 mg of Tadalafil daily, provided you are not taking Nitrates. Some people can have mild body ache after initial doses. Take care.