Is it okay to feel lightheaded and dizzy after physical activity?

1) When I do a 3-mile or 5-mile run, I run for time and try to finish with nothing in the tank. The closer I get to the end, the more I push myself, because I know I don't need to sustain the effort much longer. When I stop running, I suddenly get very light-headed and dizzy. It never happens while I'm running. I walk briskly while I'm warming down, but that doesn't prevent it. Why does this happen? Is it dangerous?

2)  Sometimes after jogging a while, or cycling a great distance, my head begins to spin and I feel as if I'm going to pass out. Is it normal to have feelings like these, and if so, how intense should these feelings be?


How do I begin to talk with my children about sex?

I have three young daughters (ages 8, 6, and 3 years), and I know that it is about time to begin teaching them and talking to them about sexual issues. But my mother never talked to me about such things, so I really don't know where to begin. I do need to do it soon, though, because I was molested as a child and I don't want my girls to go through the same thing, you know, thinking they have no one to talk to about such things. Because my Mother never believed me when I told her that someone had molested me, I want my girls to be able to talk to me about anything. But I am very shy and easily embarrassed by certain issues, such as sex. How can I overcome this, and how do I spark a conversation about sex with a six-year-old, what should or shouldn't she know, and how can I explain things so she will understand? Same thing for the three-year-old.


Why did she break up with me?

I don't know what I did wrong. My girlfriend of one and a half years broke up with me out of the blue. We never fought or argued. I asked her why, she said "I don't know." I asked her what did I do wrong and she said "nothing." She was my first ever girlfriend and I was planning to ask her to marry me. I don't understand what I did wrong. There has to be a reason. Why won't she tell me?


Can our relationship survive summer break if we haven't had sex yet?

I am a 19-year-old college student and am seriously involved with my boyfriend who is a 20-year-old college student. We have even talked of getting married someday. Our relationship is very close and we talk about everything, and he is very wonderful and supportive. I feel very committed to him and would really like to have sex with him. We have tried twice, but it hasn't really worked out because my vagina is too tight. I am pretty sure the problem is just that it needs to be stretched more, because I have been to the gynecologist and don't have any infections. He says that he is okay with whatever we do and that he loves me no matter what, but I still feel guilty about not being able to go all the way. How do I get over this guilt? I will be leaving college for the summer soon and we will be separated for awhile and I want to make sure that our relationship is as solid as possible before I leave so we have the absolute best chances of surviving the summer!


How do I tell my girlfriend I'm sterile?

I am an 18-year-old male. And I lost my ability to reproduce in a bull riding accident at a rodeo I competed in about two years ago. I would like to father children more than anything. And now I have a girlfriend who is talking of wanting to have kids in the future. But I can't bring myself to tell her that I can't because I still haven't dealt with the problem of coping with it myself. I need to know how to deal with the fact I cannot have kids, especially now that my significant other wants them, but is ignorant to the fact that I am sterile. Please help me ASAP! This is tearing me apart.


How do I learn to love?

I don't know what love is. My family thinks it's a kind of trade, or reciprocity. If they do for me, they demand "love" in return. I'm pretty sure that isn't love. I'm an adult now, and have no desire to be indebted to anyone, hence I don't pursue relationships. But I'm pretty sure love isn't reciprocity, and I know I've never felt love. How does one go about learning to love?