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Human Reproduction: A Seafarer's Guide

How a pregnancy happens is a lot more complicated and a whole lot more interesting than just a sperm cell and an egg cell running into each other. Here's our map to the way there...or not.

The Roundup of “I Get an Erection When …” Questions

Anonymous asks:

I get "NRB"s (no-reason boners) very often. Why do I get an erection when I'm not aroused?

A cornucopia of "Can I get pregnant if...?"

Anonymous asks:

Does precum contain enough sperm to get you pregnant if you have sex when its present? Also, if the guy pulls out and the cum gets all over your vagina and the a few minutes later he re-enters you, is that a pregnancy risk? My friends have told me that it's impossible, but I don't know. I'm scared, please help!

If we're just rubbing genitals, are there still risks?

Anonymous asks:

Hi I'm a 17 year old girl and I've been sexually active with my boyfriend for a few months. We always use condoms. But recently we have been trying this new thing where I sit on him, facing him (naked obviously) and his penis is straight up and we just kinda rub up and down for a little bit. He always pees before we do stuff cause I hear that lowers pre-cum risk and also I always watch his penis as we do this so I can make sure I see nothing coming out. Also, My vagina never touches the head, it just rubs the base. Is there a pregnancy risk here? I thought it sounded safe but I still wanted to know for sure. If it's not we'll stop!

But then he put a condom on, is there still a risk?

Griz asks:

So this all started a month ago, I had been on my period for five days and I had sex with my boyfriend during my period. Around four days later we had sex again. Then we had it once more a week after. He usually goes in me for like 15-30 seconds without a condom, and then he puts a condom on. We've been thinking that I am pregnant, but instead of going anywhere to get checked, we're just waiting for me to get my period, because he thinks he didn't pre-ejaculate and I didn't know you couldn't feel pre-ejaculation until I read other peoples questions and your answers. We're just so afraid that I might be pregnant. We're both young and not ready for a baby. I AM SO SCARED! I can't even explain I have a bright future ahead of me. Is there a possibility I can be pregnant? I am going to keep waiting for my period its supposed to come next week, but what do I do? I am so afraid to even think about it. PLEASE HELP ME!!!! What are early signs of pregnancy?

When does pre-cum come out of a guy's penis?

Love11 asks:

When does pre-cum come out of a guy's penis? Does it come out when he gets an erection or does it come out when he is actually having sex? Does it depend on the guy?

My boyfriend doesn't get pre-cum!

Love11 asks:

Is it possible that some boys just don't pre-ejaculate. I don't believe that my boyfriend ever does. I have checked multiple times to see if there is ever anything on the tip of his penis after he gets an erection and there is never anything there. Also, does pre-ejaculate always contain sperm?

Pre-ejaculate, could I be pregnant?

Anonymous asks:

If you don't know that your partner pre-came and you were having sex...but then 2 weeks later you didn't have your period could that be that I'm pregnant or could it be other things??

Manual sex + pre-ejaculate = real pregnancy risk?

Lucy asks:

I'm 17 and my boyfriend (16) and I have been dating for 2 years. We have decided to not have intercourse, but we do have manual sex sometimes. The last time we fooled around was about 2 1/2 to 3 weeks ago. I had my period last week, and it was on time, but only red blood for 2 days; then it was pinkish brownish stuff. Today and yesterday I've been peeing nonstop. My boyfriend doesn't think he pre-cums, ever, but I did feel something at the tip of his penis--was it urine maybe? I'm worried that maybe he had pre-cum on his fingers when he touched me (he went in pretty deep) or that I touched myself with it using the bathroom. I'm really worried that I'm pregnant; please help.

I took EC one day, and then the condom broke the next. Am I at risk?

Anonymous asks:

Okay, I am really frustrated. My boyfriend and I had unprotected sex 2 days ago. He pulled out, but I was still worried so I went ahead and got EC the next day and took it. I felt a lot better about the whole scenario. Then, the day after THAT, my boyfriend and I had sex again, this time with a condom. He literally JUST went in when he said he felt something funny and pulled out right away and noticed it ripped a little. I FREAKED OUT. He probably had it on wrong or something. I don't know what to do now. He didn't ejaculate inside of me but the chance of pre-cum scares me to death. He did go pee before, so does that mean there was probably not any pre-cum? I can't get EC AGAIN. I just took it the day before and I don't have another $45 on me. Plus, I'm only 17 so I got a friend of mine who is 18 to get it for me and I don't wanna ask him again. Am I freaking out too much? Are my chances of pregnancy pretty low? Oh, and don't worry we both don't have any STI's (he got tested and I was a virgin before him). That's at least one less thing to worry about.

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