I'm newly married, just about two weeks ago, and I've been having some issues when trying to have intercourse. My erection doesn't seem to last. When my penis gets hard and I attempt to enter the vagina, it suddenly loses the erection. Even if I do manage to get it up again, the same thing keeps happening. It's really depressing and making me anxious. Do you think this is a permanent issue? Also, my penis is around 11 centimeters longis that adequate for sex? Is there a cure for these erection problems, or is there something I should be doing differently?