A lot? For both? Really? Well, I'll be. Not even in the school aged yaoi have I come across any I can recall where both were specifically outed as ... virgins. In fact, I've always been gobsmacked by how experienced they are. If they were virgins to homosexual experience, it usually turns out they've had a couple thousand girlfriends prior. Remarkable, really.
How about a tag search?
http://www.mangago.me/tag/virgin+seme/
You might have more chances of finding a virgin yaoi couple if you go after a virgin seme first, but that's not promising much.
These two come to my mind:
http://www.mangago.me/read-manga/brother_ougi_yuzuha/
http://www.mangago.me/read-manga/critical_lovers/
http://www.mangago.me/read-manga/oujito/
i think so?
http://www.mangago.me/read-manga/junketsu_drop/
http://www.mangago.me/read-manga/koi_wa_ina_mono_myouna_mono/
http://www.mangago.me/read-manga/aruji_no_oose_no_mama_ni/ (ch.7+8 are sequel to koi wa ina mono = sex scene^^)
http://www.mangago.me/read-manga/soba_ni_oitene/
http://www.mangago.me/read-manga/vanilla_resort/
http://www.mangago.me/read-manga/hana_shinobu_no_koi/
http://www.mangago.me/read-manga/hima_na_no_de_hajimete_mimasu/
http://www.mangago.me/read-manga/wagamama_dakedo_itoshikute/
http://www.mangago.me/read-manga/ouji_hiroimashita/
http://www.mangago.me/read-manga/u_don_t_know_me/
http://www.mangago.me/read-manga/otona_keikenchi/
http://www.mangago.me/read-manga/perfect_xxx/
http://www.mangago.me/read-manga/bikkuri_suru_hodo_doji_na_koi/
the seme is so airheaded its cute :)
Good yaoi stories where seme and uke are both virgins? I'm sure there's alot. Please give me lists?