If you use a condom for the first round and does not use if for the second round, the girl cannot get pregnant

FALSE - Each time you have sex and experience an erection, you release semen that contains sperms. The condom prevents entry of sperm into the vagina which acts as a barrier to prevent pregnancy. This means each time you have sex you should use a condom to prevent the fertilization of eggs by active sperm, which can result in pregnancy.