Insecurity about face sitting /u/Sudden-Economist6793 Sex

So I (19 F) am on the heavier end of the spectrum and have had many guys ask me to sit on their face (either as a joke or seriously, I’m not entirely sure). When my partners usually ask in the bedroom, I tend to get really self-conscious and insecure about my weight because what if I do and I end up suffocating them or once I climb on top, it turns out to be a really unflattering angle and they decide they don’t want to be with me anymore? When they ask outside of the bedroom, I usually brush it away as a joke about how lots of guys claim to be into MILFs but will only go out with older women that are skinny and don’t actually look their age, i.e., like when they’re talking about curvy girls but actually only mean girls with huge assets but a really slim waist or like an hourglass figure. So when a guy (say 20-25 y/o) says “sit on my face”, does he actually mean it or is he just sort of playing along with “popular” culture?

So I (19 F) am on the heavier end of the spectrum and have had many guys ask me to sit on their face (either as a joke or seriously, I’m not entirely sure). When my partners usually ask in the bedroom, I tend to get really self-conscious and insecure about my weight because what if I do and I end up suffocating them or once I climb on top, it turns out to be a really unflattering angle and they decide they don’t want to be with me anymore? When they ask outside of the bedroom, I usually brush it away as a joke about how lots of guys claim to be into MILFs but will only go out with older women that are skinny and don’t actually look their age, i.e., like when they’re talking about curvy girls but actually only mean girls with huge assets but a really slim waist or like an hourglass figure. So when a guy (say 20-25 y/o) says “sit on my face”, does he actually mean it or is he just sort of playing along with “popular” culture?