after 20 mins of foreplay
anytime you feel ready and is over the age of 18......
As long as you are being safe, of age and feel ready, yes.
You may do that when you have a boyfriend and are ready to have sex. Otherwise, that will be inappropriate.
Consider whether you feel comfortable with the idea of sex. If you feel comfortable and you feel emotionally ready to go there with that guy then you could tell him you want to. If you don't feel comfortable, tell him and don't rush into anything your not ready for. Don't let him pressure you into it. Also consider any laws regarding the legal age in your area.
If by "do it" you mean have sex, if you don't want to, don't. You aren't ready. When you're ready, you'll want to have have sex. Don't ever put yourself in the position of having sex when you don't want it. You will feel incredibly cheap.
They don't. They might not feel ready to have sex with someone else though. At the age of 15 the majority masturbates.
Unless you feel that your ready and committed to having sex, make sure that your being safe and reasonable and doing it with a person that you trust.
when you and your partner feel absolutly ok together and dont mind, then you go for it. if you feel a bit embarrassed about seeing each other naked or worried you wont do it right, dont worry. it's natural. and having sex will come automaticly. but make sure you are both ready for this.
No one said you can't have sex while you are on your period, but it is messy and some people prefer no to do so. You are married have sex when you feel ready!
They can have sex for fun and not worry about having to look after children until they feel they are ready or want them.
It's a personal thing- if you're not ready for sex don't do it. Also, you should want the person concerned in a non-sexual way as well. Sex for the sake of sex is way less fun, trust me. I'd say if you're fifteen or older, and feel that you're completely ready then you can go ahead.
That is above average but if you feel this way you are not ready to have sex.