I have been having sex for a few years now and there have only one or two times where I have. Any advice/tips/trick on how to get the job done?

For one thing don't think of it as a 'job'. Sometimes, thinking too much about the destination takes away from the natural build up of the journey. For some, orgasm begins with arousal and getting the mind as aroused as the body is.

Can you orgasm while masturbating?

A lot of women can't climax without direct clitoral stimulation either with a toy or by hand. Some positions are better at providing stimulation, but are something that you would have to experiment with.

I have the same issue. I have been having sex for a while now, and I will say not a single time I have had sex have I had the big O. It didn't matter if the guy was big, small, thick or thin none of them worked. I have had it during forplay or fingering but not during sex. It's just one of those things some of us women have. For me it is not possible to have the big O without clitoral stimulation. I thought something was wrong with me but then I read that it actually is very common for most women not to be able to. Try having your guy do a little stimulation before you jump into intercourse and see if that helps. Sometimes just as in my case it just doesn't happen

There have only been a few times in my sexual history where my partner has Orgasmed as a result of penetrative sex alone. My current GF tends to use a vibrator while she is on top of me. She tends get a better orgasm when she is 'filled' and using a vibrator.

So don't worry about not being able to orgasm during sex. It's normal. That being said it doesn't need to be a regular occurrence. Get some toys. Get him to slow down. Get him to 'finish you off'. Finish yourself off.

My GF has told me that sex is fun. Getting off during sex is better, but isn't required.