Why some girls don't admit they masturbate?

FatMu
So , I am with this girl for over 7 months. And at beggining of our relashionship , I go at her place to pick her up for a date. I didn't call her to say : I'm on the way , cause she said , whenever I'm ready just come and pick me up. So I walked in and there she is , laying in her bed , masturbate to the point she is rolling her eyes , screaming my name , and with the wettest bed and pussy I've seen in my entire life. So basically I slowly retreat and get out of her apartament , go down stairs and call her. She said ți wait her downstairs , cause she's coming in a few minutes ( basically we all know what a few minutes mean for a girl , and she allready "come" ) . Anyway , I didn't want to make a scene or make her mad or something , so I didn't tell her what I just saw. But I conducted the conversation through the point of where I asked her if she masturbate and if she masturbate that day , speacilly cause she was single for 2 years and I know we were only teasing with each other. And she denied , like damn , she was furios cause I asked her that. But she chill off fast , and looked in to my eyes and told me she didn't masturbate in the last year and she is not doing very often. But after what I just saw , was hard for me to believe. So that made me think , maybe because she didn't had sex in over 2 years and we were dating for a month allready , and I've never gone for more then a few rubs and few breast plays and teasing (and even now after 7 months I still didn't , but this because she is out of country for about 5 months now ) and all of that coming together was maybe to much and she exploded. So the other days we were chating and she forget her videocall open and she start masturbate again this time using a small dildo and again she was screaming my name. Best 20 minutes ever. So I asked her again last night , if she ever masturbate since she is off the country or or thinking of me in a sexual mode. And she denied , again. Why?
Why some girls don't admit they masturbate?
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