Your yellowish, foul-smelling discharge after intercourse can point to an infection like bacterial vaginosis or an STI. This can happen even without itching or pain.
Next Steps
Please see a gynaecologist for a vaginal swab test. This will show which infection you have and guide the right treatment.
Health Tips
Avoid douching or scented washes until you're seen. These can irritate the area further and mask what's going on.