I want to take sex but i cant. why ?

No one could answer: this question, M, without a lot more information. Sorry you are having the problem. You really should see a counselor or a physician with whom you can discuss everything openly. Good luck to you!

Erectile dysfunction: Your question is not very specific. Are you having difficulties with getting an erection? If so this could be due to performance anxiety (where you are feeling nervous with your partner and therefore cannot get hard) or could be because of a blood flow problem to your penis which can be resolved with using meds such as Viagra and Cialis. See your doctor to discuss options.