Transmission of sexually transmitted diseases

Good afternoon,

I was wondering if the risk of transmitting sexually transmitted diseases is reduced if the partner does not ejaculate into the vagina or is the same likelihood of infection at any stage of intercourse, even if it lasted a minute without a condom? 

Thank you in advance.

Transmission is possible regardless of ejaculation and duration of sexual intercourse. Therefore, even for a minute, as you state. Furthermore, the transmission of sexually transmitted diseases can occur via the contact of skin-to-skin, mucous membrane to mucous membrane, without actual sexual intercourse.