Even when you don't have any physically caused sexual issues; you can
still experience "penis problems". Here's a few of the most common
ones-

"Everything goes great with the foreplay, but when I slip on the
condom, I can't feel much so I go limp!"

The main culprit behind this problem is masturbating with too tight a
grip. Here's what you need to do- abstain from masturbating; or if
you really must masturbate, use a very light grip. When you get ready
for intercourse, use your condom. You may go limp the first few times-
that's OK. After a few sessions, your penis' sensory threshold will
have readjusted itself, and you should be able to perform fine.

"For some reason, I start to get nervous once intercourse is
inevitable. I react fine for any other activity."
The ability to perform is something that a lot of men needlessly
stress over. Your penis' function is to get hard. When we create
imaginary fears, we interfere with that process. That particular
problem is covered in more detail HERE

"I come way too soon! It seems that the second I put it in, I spurt!"
The stop and start method (covered
HERE) is definitely one
of the best exercises in solving the problem of premature
ejaculation. Another quick way to prolong your sexual stamina is for
you to bring yourself to orgasm BEFORE your lovemaking.

If you're with your partner, you may simply excuse yourself to go to
the restroom and masturbate to orgasm, which will delay your need to
ejaculate as quickly the next time around.

Another way is to have your lover make you ejaculate before anything
else, then resume by pleasing your lover in other ways while you
become erect again. As stated before, since you have ejaculated
before, you won't have the desire to ejaculate so quickly the next
time around.

These exercises should help you conquer most premature ejaculation
problems. If they don't, professional counseling or therapy is
recommended.

Big Al