There are plenty of proof that psychosexual dysfunctions such as Erectile Dysfunction, Vaginismus etc are due to stress.
Apart from the individual member suffer from the problem, the problem of one member can also lead to psychosexual dysfunction of other member.
For example, wives of men having ED reported vaginismus and dyspaerunia.
Similarly, the husbands of the women with psychosexual dysfunctions also reported ED.
Psychosexual dysfunctions also play a major role in infertility.