Why would a guy use tongue for a first kiss?

I have dated this guy for about a month and we didn’t kiss until recently, but it was surprising cause he just went from 0-100 and basically stuck his tongue in my mouth and I wasn’t expecting it!
he asked me if he could kiss me but then went full throttle and I was a bit taken back by it like at least have the respect to just kiss me politely the first time and work up to it.
I didn’t say anything at the time I was just shocked but when I mentioned it recently he kinda just shrugged it off and said sorry but he couldn’t help it... I’m just not sure why he did even acted that way, or is this common?
Why would a guy use tongue for a first kiss?
Post Opinion