Sexual relations and Sexual congress

Sexual relations noun - Sexual union involving penetration of the vagina by the penis.

Sexual congress and sexual relations are semantically related In some cases you can use "Sexual congress" instead a noun phrase "Sexual relations".

Sexual congress noun - The act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur.

Sexual relations and sexual congress are semantically related in making love topic. You can use "Sexual relations" instead a noun phrase "Sexual congress".