Seeex in Spaaaaaaccceee!!!

[zen_magick]

I've often dreamed of filming a porno in space.  Think about it, the money shot would just hang there it mid-air. 

It's PURE GOLD, I tell ya!!!

[Triple Zero]

if the money shot is golden, it's a different kind of porn.

[Rococo Modem Basilisk]

Well, there's one thing to do. Actually try to set up a self-sustaining colony. Maybe this should be a diplomatic cross-national project? Have couples from the space programs of various nations go up and add onto a big spinny-type space station, and tell them not to come down until they have managed to raise a few kids.

[Rumckle]

According to Ye Olde Wikie the annual amount of money spent on porn (in the US) is $4.3 Billion, NASAs yearly budget is $17.something Billion.

Even if NASA got 100% of the porn audience it doesn't cover their government funding, unfortunately.

[Richter]

I think NASA is so reticent about zero-g sex because they know that it'll ruin everything if people find out how fun it is.

"Ruin everything" = "increase public interest and private investment"

Similar to pornography driving the development of personal media viewing and information distribution.

Not similar, because pornography is a business and NASA is a gov't funded program that needs to keep up appearances to it's benefactors.

In the broader sense of interest in sex serving as a driving force for technology.  It's not the ONLY driving force, as evidenced by CNN and the internet not being ONLY composed of porn.

Related, there has been a good degree of speculation in Sci - Fi about zero - gee screwing. 
I recall Aurthur C. Clark writing in "Rendevous with Rama", that career cosmonauts found sex down in full Earth gravity as too cumbersome to be really enjoyable.