Sex unprotected

Milly jane
Me and my boyfriend always have unprotected sex we started off with a condom for a year then we stopped useing them I am on the pill so I'm pretty safe and we use the pull out method but I just don't wanna catch a STD and I don't kno how to prevent it from happening cause we like having sex without a Condom well he dose I don't mind it is easier but I have had a STD once before and it wasn't a present feeling 
Does anyone kno how u can prevent getting an Std but still don't have to use Condoms