Dear Rajan, your questions are not complete. We are not getting the full spectrum. However, for your first question it is nothing wrong by giving your mom's panty to your friends. If you can enjoy by seeing their mom's panty then they have every right to do so. It’s a common fantasy of your age and nothing new. And by seeing your mom's panty, they are not going to rape your mom, like you did not do anything. In addition, it is not clear that if your group returns the panties after use or not. Now, in my suggestion is that give them your mom's used (unwashed) panty secretly, so they can smell your mom's odor and can enjoy like you did by using others.
Now, for your second question, it is very hard to lead a happy married life with aunty whom you want to fuck only. It’s a fantasy and if full filled then good. You have not mentioned your age that's why it's impossible to suggest that you can take some time from your mom to get married, till then keep trying.
Now, for this question, are you sure that your friends mom is a prostitute? If you approach her like a prostitute, then what is the difference between visiting a red light area and fucking your friend’s mom? You definitely will not get the excitement of fucking friend’s mom. First, establish a good relation with her and with her son also separately from your group. You can use your mom or her panty to this particular friend to get her mom. Please write about your mom and your friends more to give better suggestion.