You have raised an interesting pt! i forgot about precum.. I did a
search and it seems there is a chance that precum may contain small amt of sperm (from previous ejaculations.. even though urinating may reduce the sperm count in the precum to very low level)
Oh, I just found a poll on sbf about similar topic
Dare to do raw with gf?
there is no 100% safe without rubber i guess. Unless the girl is on pill (hmm, which is on my consideration list now too)
Are there any particular (brand/series of) condom that may feel more comfortable for the girl? I have no qualms about using it.
I don't really understand when she says with rubber, the friction gives her 脱皮 feeling... .. is she just not accustomed to it yet? any sisters or brothers' gfs also feel that way?