Sorry I didn't mean to offend anyone - I asked the question as I struggle to orgasm during sex but want reassurance that I will be able to get pregnant. Oops, didn't really think how personal a question it is!!
Thats ok, like red has said, you dont need to have an orgasm to fall pregnant so dont let that worry you. Dont try to hard either, to fall pregnant that is, as the stress and anxiety could prevent things from happening. Just relax and have fun and let nature take its course.
It's not essential asteroid, but I have read that it can help somewhat.
Also, I am not sure that there are that many people who could tell you the exact night that they conceived (go on everyone.... prove me wrong now....) so as to be sure that they had an orgasm through... erm..... penetration that particular night or not.
Blimey, I am blushing 'ere. Good job none of you can see me ;-)
Apparantly the contractions of the orgasm aid the passage of the sperm towards the egg. However, they seem to get there anyway with or without an orgasm and I guess it depends on the timing of the egg release etc. Or maybe the mother is just so chilled out - it de-stresses her and gives the sperm good vibes!
The physiology behind the female orgasm is simple. When a woman has an orgasm her cervix, the mouth of the uterus, contracts as the uterus moves. This causes the uterus to dip or bob into the vagina. If the male has already had an orgasm, then this area is rich in semen (sperm). This motion of the cervix will actually draw the semen into the cervix and uterus to aid in it's passage towards the ripe egg.
3ight8ball as you can see from Nats link she is perfectly correct. I would have assumed someone of your intellectual stature would have know this (warpig takes tongue out of cheek).