<human>: To clarify, I am a freshman in college and am dating a girl who has told me she was in a four year relationship with a black guy in which they had sex... a LOT. So right away stereotypes are freaking me out to the point that I'm afraid I'll be inadequate. 

The first time we had sex, I'll sorely admit it didn't last very long. 

The second time, about a week later, I brought her to orgasm twice before finishing myself. 

The third time lasted longer than the second, but she didn't orgasm. And the last time we had sex, she only orgasmed once, but it was a huge **screaming** orgasm, after which she asked for a rest and giggled for five minutes at how great it was. 

My question for you, Reddit, is this:

1) I want to continue having sex after I climax, because I want to please her... but i'm extremely afraid of the condom failing after filling it's purpose. And advice?

2) Why is it that some times I can't make her orgasm, some times I can, and other times it's "the biggest orgasm she has ever had"?

Can you provide a brief overview of the text?
<bot>: Had sex for the first time a few weeks ago; wanted to know if it was safe to continue sex after climaxing with a condom; wanted to know why orgasms differ each time.