and how do you bet flopped nut str8 with 2 flush cards?

i dont' have a specific hand for this, and i know it comes up alot... what do you guys do when you flopp a nut striaght that is vulnerable...ie... 2 flush cards... or u know 2 pair or a set is out there.....

ever time i bet the pot to drive away the draws.... i get called and sucked out on.....

so should i wait on my nuts, and give people a chance to outdraw me? (im thinking not)

this situation and my other problem with top sets is the 2 main leaks in my otherwise decent game.... i'd like to fix it...

thanks in advance