Your boy friend seems to have candidal balanoposthitis
.there may be redness on glans with burning sensation mor after intercourse. The disease is caused by Candida albicans and spread by sexual contact. You and your boy friend should take antifungal therapy. I advise in my patients antifungal like ketoconazole
orally for two weeks. Application of clotrimazole
may improve the disease. Washing the area with antiseptic like dettol in water may enhance the improvement. I hope you got my answer.
Dr.Ilyas Patel MD