Tantra [1]

I first became interested in tantra when I heard that its was an implement of healing through sexual relationships, as described in the title of this webste. I therefore interpreted tantra as a pro-sexual practice at a higher, more spiritual level. However, after reading some of the forum topics, I saw that people were asking for help to restrain from sexual activity. I am confused. Obviously, I did not do much research before joining the site; but, I am intrigued and would like to learn the fundementals of tantra.