[Underpantsman]

Just do it on one branch buddy not the whole plant if you are just trying to see what sex it is, if you want to flower it, thats gonna be a bitch and probably not worth all the trouble you will go through for 10 weeks straight unless the plants are somewhere you feel secure doing it like your backyard. Going to put a bag on a plant every day is gonna get noticed by someone. Also that bag will probably cook your plant, use something that breathes if you must try this. For the record I think its a bad idea to try and flower a plant in mid-summer.