A weird Sex Question?

so do u think its weird for someone 110 lbs to have sex with someone 160 lbs ... im skinny and i wanna gain more muscle and i don't wanna appear un-sexy for lack of a better term soo what do you think about it.. should i go for it cuz im fit im only 5'6 at 110 lb male and i guess im a lil nerves sence he's bigger than me u kno..