Hi welcome to healthcareMagic
is a sexually transmitted disease
, both the partners need to be treated at same time to get cured completely... Antibiotic must be taken completely for 5 days , after then she must get checked once more to rule out any recurrence.... then only she can have sex with partner... with out complete cure , better not have sex, and use of condoms is better to avoid such transmission...
Hope i have answered your question