There is a mountain of myths about sex in the shower. Some people say it is completely safe while others say the opposite.
In conclusion, having sex is safe and certainly fantastic.
The experts always advise the use of the lubricant, so that penetration is easier.
Also something worth mentioning is slipping. It may seem strange to you, but there have been cases which have ended in fatality due to slipping during sex in the shower.
Try not to experiment too much with the positions and try the ones that look safer.
And last, try not to use condoms. Using the condom in the shower may become the cause of the break or the remains of the vagina.
So instead of risking, put the sex with protective measures somewhere else in the shower!
Source: Popsugar