How Can Infertility Be Treated?

Hi, We are planning to have a baby since last one year; however, we face difficulties while having inter-course. The major issue is that pennis doesn t go smoothly in the vagina. So, we started applying coconut oil on n penis and vagina - so that it acts as a lube. We were able to have inter-course using coconut oil for continuous 4-5 days per month for last 2 months. The sperm was also transmitted into vagina. However, my wife has not been able to concieve yet. So, we had the one question Is coconut oil safe while having inter-course and will my wife ne able to concieve and thus get pregnant while I use coconut oil while having sex (inter-course). Please advice. Thanks.