Recovered mormon here...
I even got baptized for some dead relatives when I was younger
education of mormonism can be found here:
http://www.mormonwiki.com/Main_Page
My cousin is actually a main contributor to that site.
Aaron, your friend is a jack mormon. He is also wrong about the whole open arms thing, at least as an overall thing. Producing porn and consuming it are both looked down upon.
The family on Big Love are part of the separatists, like the RLDS and TLC
I have a lot of cousins who have gone on missions, married their high school sweethearts and most of them are still married today. One of my cousins is a high ranking bishop in Orem, UT. While there are some who are major hypocrites, there are also many who are devoted to their churches, their families and their beliefs. The only reason they accept me "with open arms" is because I'm family, not because they want to embrace a sinner.
I also remember when my uncle's house burned down. His neighbor, who owned a construction company helped rebuild his house with funding provided by the church. Volunteers came out and helped him rebuild his house. So, many can shit all over the mormons and I've had my share of trouble with them and the religion as a whole, but I've seen a lot of them show humanity and more of a christian attitude than most self-proclaimed christians. I remember when my father got laid off after working for 13 years at US Steel and Christmas probably wasn't going to happen, yet the church pulled together and several members brought over food, gifts, etc.
Anyways...back on topic, haha...
your friend is trying to have the best of both worlds...he wants to be embraced by the lord when he ascends to the Terrestial or telestial kingdom, but also enjoy destroying his holy temple (his body). But, not every Mormon is a perfect mormon.