Although many factors go into a relationship, physical intimacy is an important part. Chemistry between partners is essential not only on a mental level but also on a physical level. Sexual issues, no matter their frequency, can make relationships awkward and unfulfilling.
On the male end, common issues include performance anxiety, premature ejaculation, erection problems, inability to achieve orgasm, and pain during sex (dyspareunia).
On the female end, issues include pain during sex, vaginismus or inability to achieve orgasm
Stress, fatigue, anxiety and other physical or mental conditions often contribute to these issues.