If you pollinate a female with one of your males of the same strain, yes you will get seeds that are the same strain. What happens sometimes is you get certain phenotypes of the various strains that make up the strain that you have. Like for instance one of your plants may be taller, or show sex early, or grow bushier, and others may not but they are still the same strain. What you should do is take your healthiest looking male and collect pollen from it, then pollinate your healthiest female that shows good characteristics. Usually it takes about 6 weeks for seeds to mature, and then after harvesting you should let them sit in a dry cool place for at least a month. You can try and geminate before that but they probably won't crack, and if they do the plants will usually grow sickly and or be more succeptable to problems. I'm stoned to the bone right now so if I don't make sense or if I forgot something let me know.