Playing against flush draws.

A situation that I seem to run into a lot is when I'm dealt a big pocket pair (JJ-AA). I play it aggressively pre-flop, capping if possible. Often, I see two to a flush fall on the flop. In these loose low limit games, there are very commonly as many as 4 or even 5 opponents still in at this point. Assuming there are no overcards to my pocket pair, I continue to push the betting (is this correct in most cases?). The issue is, these flush draws definitely have odds to keep drawing by this point, so I can't push them out. It seems that 3rd suited card always falls on the river (not always, but it just feels like it). What I'm wondering is at that point, should I just check/call or should I still lead out? It seems like a mistake to assume someone was 'always' on a flush draw, but when I get raised or check raised (depending on position), now I've spent 2 big bets to showdown instead of 1. Anyway, I think I've talked myself into check-calling these situations, but is this right or should I continue to be the aggressor?