the thing you were thinking is called Rhythm Method. And as my bf puts it "You know what the call people who use Rhythm Method??? Parents"
Seriously, ain't such thing as a comepletely safe sex. There is safer sex, but out off all, Rhythm method is probably one of the most unreliable.

I'm with everyone on this.. There is no such thing as safe sex.. with out some form of birthcontrol..
a woman, can get preg.. ANY time of the month, hell its even possible to get preg on your rag..

jamie

maybe your girlfriend is allergic to latex?
she could also be allergic to nonoxynol-9 (spermacidal lube). that can be very irritating.
also, if you guys are ready for something so extreme as raw sex, how can you not use some form of birth control?
and
are you sure she has no STDs because you know her or because she's been tested?
many people show no symptoms for anything for a long time or ever.
basically, USE A CONDOM!!!!
-Lixme

17 isn't too young for a girl to consider being put on the pill.
if she's scared to talk to her mom she could try a planned parenthood they help out w/ that sort of stuff.
plus, just because her sister wasn't able to take the pill doesn't mean she can't.
like rawbob said there are tons of different kinds of pills so you try one if it doesn't work you try another. im on ortho tricylen lo. it has low doses of hormones but is still effective. that way you don't get all wacky...lol.
or like oberon said there are condoms made of different stuff, or maybe just try a different brand. maybe you were using one w/ lube and the lube irritated her. or maybe its the lack of lube thats irritating her.
you just gotta sample and try different things to find whats right for you guys.
just be safe while you are finding out

I really hope you are right about the STD thing. Because if either of you have ever had unprotected sex with anyone else, then you are gambling with both of your lives.

But I've ranted enough. So all I can do now is sincerely wish you the best of luck for a long and happy life.

There are also condoms made from different materials. Just check to be sure that they also protect against STDs.

An0n...there are MANY forms of birth control and many formula's for the pill. From injections, to depo provera (sp), to the patch. If your GF, and her sister, really want to enjoy safer sex, they should see another Physician for all the options!

This is so amazing! I'm not knocking An0n directly, because he/she is not the first person to ask this question. But what truely amazes me that even tho he/she KNOWS that both pregnancy and STDs are possible, he/she still wants to know if htere's a magic way of having unprotected sex - because it FEELS GOOD!

I guesss, it speaks to the reality that EDUCATION is working, but just educating folks is NO GUARANTEE that young folk will make the right choice!

Think about this folks, when you hear about the Government wanting to spend MILLIONS and MILLIONS of dollars on abstinance education. I wish more folks from Washington could read these posts so the could get a feel for what young people really want information on. Sorry for ranting!

female operation- tubaligation

But it doesn't do ANYTHING against STDs.

I wanted to clarify that there is no safe time to have unprotected sex. There may be times that are less likely to get you pregnant, but predicting those can be almost impossible, and even if you do you can still get pregnant. There is no 100% way to eliminate the chance of pregnancy short of a vasectomy or...ah forgot the name for the woman operation. But even in these cases there have been weird occurrences of people getting pregnant AFTER THE OPERATION. So please, for God's sake, use a condom to at least protect yourself as much as possible.

I swear, I swear, I swear...I am going to at least add this to my signature....USE A CONDOM!

I agree with everything Cornelius111 100%. The object is not only not to get pregnant, but not to die from having sex. And don't kid yourself, it CAN happen to you.

The answer to your question is: there is no best time. Previously, people had thought that you could predict certain times that might be safer than others. Recently, however, it has been realized that woman's period are different than had been thought. Women's periods vary from woman to woman, so it is impossible to predict when a good time to have sex without protection is. My advice: USE A CONDOM! Either that or have your girlfriend go on the pill. It is very dangerous to have unprotected sex, because of both the risk of STI's(which the pill will not protect you from) and the risk of pregnancy. Also, it isn't worth the worrying afterwards and the fear that she could be pregnant. If you and your girlfriend don't want to use protection, then frankly I doubt you are ready to have sex.

An excuse ur g/f can make is that she needs to go on the pill cause the symptoms of her period are too distressing for her, and her bodily reactions are too strong and painful, the pill can be used to help relief her of those symptoms/reactions.
She can use this excuse if she feels uncomfortable with opening up to her parents. if she's not comfortable going on the pill then really there is no period to have safe sex (without contraception)

good luck