I hate Non-virgin Seme

I always wonder why seme in manga or jp works must always be experience in sex and the uke must be unknowledgeable about it. I mean, can't the both of them enjoy first-time sex together? I can understand if they were adults but even high school mangas depict semes as non-virgins most of the time. I hate it when characters lose their V-card due to either curiosity,pleasure-seeker, or just because of some bizarre rule that teenagers must lose their v-card. Mangas with both parties being virgin are too few, only Chinese BL novels chooses the 'both parties are virgin' route