girls turn me on.. ??

Okay so im 18 and my boyfriend is 20 and our daughter is 1 almost 2. we been dating for 3 years.. I had a girlfriend years back but only kissed her.. why do I feel so attracted to females when i have a man.. its not like I want to think of femalea like that but I just really want to know how it feels to have sex with one and to be able to talk to a female in a relatio ship way?? ya know what I mean?