After all, why do Sexually Transmitted Diseases like HIV, Chlymadia, Gonnorhea, Hepititis, GenitalHerpes, etc. etc. exist except for that purpose? And why do people continue to defy the will of God and get these diseases?

No He did not create STDs to encourage monogamy and discourage the sinful practice of sleeping with many partners and this is a very narrowminded way of thinking. Think about it with common sense. In the beginning God created everything in 6 days. STDs didn't come along until much further down the road. Why would this be? Well, in the beginning the earth needed to be populated, and now it does not. The same reasons all other diseases exist. If you think STDs is a punishment or whatever, then why do you think cancer exists? You can't tell me that everyone who gets cancer is a sinful person. Also, in the Bible it was not uncommon at all for a man to have multiple wives, so your way of thinking just does not make sense no matter how you look at it. To answer your other question about why these diseases exist, it is because of all of the use of medications, and the effects they have on our bodies, which make us susceptible to various diseases, including STDs. I do not sleep with many partners, by the way, and am married, and only sleep with my husband, and I have studied the Bible much, all through growing up, until currently, and I have also studied medicine. Diseases are scientific, not spiritual. no. I think these are just mutated viruses that happened to be spread this way. God tells us not to be promiscous (i know I misspelled that) to protect us. I guess He allows it for whatever reason. If god intends them to be a punishment for cheating, why don't people catch them 100% of the time when they are unfaithful? And why does he allow the spouse of the infected person to catch it from them when they didn't do anything wrong? And why does he allow innocent babies to be born with the STDs of their mothers? If STDs are intended as a punishment, God sure seems to be punishing a lot of innocent people.