Should I have sex at 13...?

Nope. Don't do it because you want to know what it is like. That's not a good reason. Have sex when you are older and have matured more. Have sex with someone you love. (This is the belief my family has. It is a smart belief though) You might want to wait until after you get married.

You will regret it afterwards. Your relationship with your best friend will be damaged. Also don't forget the risk of pregnancy and diseases.

You won't enjoy it at all. Honestly ask any girl who had sex as a teen.,it's just bad. You don't really start to enjoy it until you are in your late teens because a young guy doesn't know what he's doing
And don't have sex unless you are ready to have a baby and raise it

Bad idea.
Your relationship will change and it will be "awkward". You dont say if your a girl or boy, but what if you got pregnant?
Plus when you do meet "the right guy" it wont be as special.
You dont say where you live but you are probably underage wherever you live.
What about your parents? If they find out, your relationship will change with them too. They may not trust you (or your friend) for a long time.
What about your other friends? Will they see you in the same way? Will people call you a .....? (insert your own word here!).
It's just not worth it to see what it feels like.

U r thinking in a very wrong way, u r still 13 nd u will probably regret it after few years.
I know u r friend is sweet, but its not a gd reason.

Try to wait until u know exactly what sex is all aboit, its all about emotion md love not just physical...
Plz be calm nd dont do anything

Do not, this guy is your friend only????? and you are giving him this precious gift that you should save for the right person you love with all of your heart. You are experimenting with dynamite. Wait for the right one and then use protection as in a condom----until you know he has not been exposed to AIDS (maybe he got a blood transfusion having his tonsils our or a sports injury, etc. before blood was tested for AIDS out or being with an unsafe partner--he may be a carrier and not know it) and if the AIDS issue is solved, continue to use a condom--this way you do not get AIDS nor get PREGNANT at age 13. The first time with the right partner if you love each other, he will help you with the pain if there is any=====very over-rated unless you have a partner who does not take the time to prepare you, help you. You do not want a wham, bam, thank you mam. VERY BLUNT BUT THAT'S THE WAY IT IS.

Probably best if you wait until you're older.

Go to a sex health clinic and ask for advice - that's what they're for.

If you are going to ignore this advice, please at least use condoms and don't be afraid to talk to your doctor.

And don't forget that you could get pregnant the first time too.

Your saying this guy is your 'friend'...... I strongly advise you not do sex at your age, 13 is way too young and trust me you probably wont enjoy it at all and it is most likely that this so called 'friendship' could turn into something very awkward especially because it isnt like he is your boyfriend. Having sex your best friend could turn into a disaster and this friendship is probably most likely to end soon after.... You could also get yourself pregnant. Now that is a bit of risk dont u think? My advice is save your virginity for a few more years at least.

I penetrate my girl best friend when we were both 10. I forgot how it feels since I'm 21 now. And we're dating now, a 2 years relationship.

That would be foolish at your young age.
Since 1965, the percentage of people who have sex before becoming married has multiplied by at least five. Do not get into this just because others are foolish enough to do this (other harming their lives).