Question for those who don't bag blossoms

[tam91]

I've finally got all my tomato plants in (pant pant) and am thinking in advance about some that I want to try to save seed from. I'll probably try bagging the blossoms, but I'm wondering about other possibilities. If you don't bag blossoms to save seed, what do you do?

Nothing - just figure the odds are good
Plant multiple plants, and save seed from the plant in the middle
Try to figure out when bees aren't very active
????