Q: We are a happily married couple. My wife is very slim and my penis diameter is considerably large and her vagina is small. So we have not been able to perform sex. We do enjoy lots of foreplay. How can we solve this issue?

A:The problem you describe is a real and serious one for some couples. There are two causes for this. There is a vaginal cause, and there is a penile cause. The vagina is very elastic and can stretch quite considerably. If dealing with a virginal vagina, you might want to seek the assistance of a gynaecologist to tackle this part of the problem. However, sometimes, the problem occurs because the penis is not rigid enough to overcome normal vaginal resistance and enter. If this is the case, you will require an andrological evaluation.