Hi, Penetration of penis either fully or partially can rupture the hymen. Most of the time, it will bleed following rupture. Masturbation might not rupture hymen in most occasions, as the penetration or stimulation might not have happened deeply. Since in your case the penetration was partial, there is a partial rupture of hymen. Since hymen is a membrane structure, partial torn hymen cannot repair itself. Even if the hymen is torn completely, it may bleed on next few occasions on having penetrative sex, because there might be few remnants of its tissue present. If at all torn hymen needs to be repaired, it can be done by plastic surgery. Hope I have answered your query. Let me know if I can assist you further.