At first glance, it's ... ahem... *cough* interesting *cough*. They seem to be constantly using the metaphor of a kettle of water getting hot - yes, that's meant exactly as you think it is!
I'm not quite sure about "redirecting sexual energy into prayer". Prayer, in my book, is a linguistic mental process, and tantra wouldn't work for me if it was focused on words.
What I find odd is the last paragraph on yonder page:
I'm Single. Do I Need a Spouse to Do This?
No, but, for a single person, Christian Tantra is quite different. Instead of building your sexual energy to high peaks, direct every bit of it into prayer. Keep your water no hotter than luke warm. If it gets any hotter, turn the fire off.
This seems at odds with the full acceptance of your sexual body, which I find to be totally essential, right there at the very core of tantra.