"I always think of everything in a spiritual war type of situation."
Yeah, it's so wise to avoid any nuanced thinking.
"satan's purpose is to steal, kill, and destroy."
If you can't show that Satan exists, you can't very well claim to know his purpose.
"Well having sex out of the design of God is definately a way to destroy one's person life."
Here again, you need to show that God actually exists before you can claim him to have designed particular sexual practices.
"Sex is an easy weapon for satan to use to do this."
Prove Satan exists.
"Having sex, but knowing you are not going to have a baby is adding fuel to the big BOMB fire that is already burning."
So your claim is that only penis-in-vagina sex during a woman's fertile days is acceptable. What a bore you must be.
"I don't even think we have seen the worse case of VD."
Since your sample period is open-ended, a nastier form of STD is almost sure to evolve.
"If sex keeps going rampage - things are going to start falling off - I really believe as behavior worsens so do the diseases."
Certain behaviors may spread diseases. I suppose inappropriate use of antibiotics is a behavior which could evolve nastier STDs, but that's the only behavior I can think of which would effect the severity of an STDs infectious agent.