Ok, I think that the answer to this was already known, just not tested to make sure. To test for Lifeloss I used a couple of simple things.

I used a Palasaulo (Zoom/G) that I already had tested for its Lifespan, so I knew when his life was supposed to end. I used all of the Ran Ran types because I thought that the more you search, the more Lifespan would be taken. I also let the ranran's run out to the point where Fleria tells you that you must go back. If I encoutered a battle, I reloaded, because I think that if I did'nt than it would of messed with the Lifeloss. Well anyway, heres the chart:

LL = Life Loss

Ran Ran Type	Smell	Leaf	Fruit	Extract
1 Venture	-0 weeks LL	-0 weeks LL	-0 weeks LL	-0 weeks LL
2 Ventures	-0 weeks LL	-0 weeks LL	-0 weeks LL	-0 weeks LL
3 Ventures	-0 weeks LL	-0 weeks LL	-0 weeks LL	-0 weeks LL
4 Ventures	-0 weeks LL	-0 weeks LL	-0 weeks LL	-0 weeks LL

Now it would have been easier just to tell you guys that "Ventures don't take Life Span" but just to put some kind of proof or whatever you want to call that, so you have something to look at. Also, if you have any other questions/suggestions,etc. Post'em.