Giving a man your number is ok but it might be smart to take his if youre really interested. Keep in mind there is also the luxury of social media, you dont need to break that boundary if you dont want it.

What to do when a man gives you his number?

3:485:05What Do You Do When A Guy Gives You His Number? - YouTubeYouTube

How do you deny a guys number?

Just tell him no.For instance, you could say, Thanks for asking, but Im not interested.You can also just give him a number to stay in touch as friends, as long as you are abundantly clear about it. For instance, you could say, I dont mind giving you my number, but I would only do so as friends.