Dating While Pregnant

Why is it frowned upon to date while pregnant? If my relationship with my child's father didn't work out, am I suppose to not have a dating life. If he has moved on am I at a stand still because I'm caring his child. People say you should be focused on the baby. I'm a MOTHER. I can multitask. My baby is fine has everything needed for delivery, so what about the mother a pregnancy is not a death sentence. I should be able to date and even have sex with whom I choose. Why is there a double standard? 
UPDATE!!!
First thing people say is STD🙄 I'm sure nobody (or would hope) nobody would sleep with someoneknowing they  have something. I've been having sex for a while and have NEVER had an STD. Of course I wouldn't go passing out vagina to just anyone but I have been friends with a guy for the pass 2 yrs and if decide to start dating him and we have sex I don't see why it's an issue. 

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