Unprotected Threesome with Sisters

[Mdanister]

Hi,

I recently had a threesome with my wife and her sister. Till now me or my wife has not had any sexual intercourse with any other than ourselves. My wife is one a birth control plan (loop) and I always climax internally. Her sister is also married and she normally engages with her husband not regularly and he doesn't climax inside of her and they use anal as a method to climax inside of her, she's a lesbian but she has a child as well. Both my wife and her sister want me not to where any protection (condom). I was thinking if its ok to first have sex with my wife and to wash my penis and to have sex with her sister and repeatedly doing this is it ok. And we tend to continue for the second time after I climax with one of them. Is it healthy to penetrate both of I have ejaculated in one of them. Or should I use external ejaculation as a standard. Has we consume alcohol while we engage in a threesome can I use a diluted alcohol as a sanitizer to clean my penis after penetrating one and before penetrating the other. This sexual intercourse may occur ones every two months. I would like your honest feedback on this.