What's the reason we gain weight after oral sex...I started 3 weeks at the time my weight was 58 kg noe I m 70...before a week I change my diet and routine but still I m in same position...weight just on belly and side pockets
There is no relation to the two, so whatever is making you fat has nothing to do with fingering. You can't get pregnant from fingering, so that's not a possibility either. You should look at what may have changed in your diet or activity level. Or it could be a response to new stress in your life that wasn't there before. Or it could just be hormonal. But you can be 100% sure that gaining weight has nothing to do with fingering.
No, this can not make a girl or woman fat. You might want to make sure that your boyfriends hands are washed prior to allowing his fingers or anything for that matte inside of your vagina, or in this region. You coud become infected with any germ or bacteria that may be under his finger nails, or on his hands. You might notice some bloating in your belly, afterward. That may come from too much pressure, too rough, or like I said above, an infection.
The two things might not be related. The only ways I can think of that they are would either be that the girl feels guilty and eats because she is stressed, or the guy had semen on his fingers and the girl got pregnant.