Yanbi, that's certainly the most common form of Joint Venture ... the 'endorsed mailing', usually paired with promise of a reciprocal if the promoting partner is successful in their efforts.
But, IMHO, it only scratches the surface of what a Joint Venture relationship could be ...
Successful Joint Ventures often evolve into a network of JV Partners that work on all facets of a JV Partner's promotion, from product creation to the Marketing system, copy writing, graphics, video, and site design to bonuses, upsells, pre-launch test mailings and more ... far from just a simple 'I'll promote your launch, you promote mine', but actually helping assure that the product and launch is successful through team effort.
If one is simply looking for affiliates to promote an affiliate program during a launch phase with no promise or interest in reciprocation or interaction outside of focusing on promoting the current promotion, and the affiliate program in general, I'd call it 'recruiting affiliates' rather than 'attracting JV Partners'.