don't worry..dear..
you have a right to yawn without covering your mouth with your hands in front of your friends or family.
I thinks it doen't matter who(man or woman) have to cover his or her mouth when they yawn.
cuz it's a question about manners.
man have to cover his mouth,too. if he have to. some like official place .
the point is our common sense or public opinion.
personally I don't care about that,but some of old generation dont feel good if "woman" may yawn not covering her mouth with hands.
cuz they are taught woman shoud keep so called "womanly behavior".
and i agree with them partially...forgive me..
woman is beautiful when she acts like woman...
I hope you don't think I'm conservative....
I'm too free and open-minded to control....
did I answer correctly to your answer? I don't think so.
anyhow there is no love which can be kept forever.