Full Bladder Theory for Conception

So, I just had my IUI done two days ago and when you go in for an IUI they tell you to have a full bladder because it's easier to get the catheter through your cervix. Would this not translate to fertility in general? If a catheter is made easier by a full bladder, conceptually sperm should be able to access the cervix easier as well during intercourse with a full bladder. What do you ladies think? Also, not part of the poll, but still a question- is there any evidence or studies to support this theory? 

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