Trying New things

Hey all

Lately after I had my daughter I’ve realized that I may be into new things sexually ( roughness, threesomes, and the male G spot) but I don’t know how to bring it to my partner for multiple reasons

1 I don’t know if he’ll be into it

2 I don’t know how ask to stick my finger up his butt Lml

3 who would we invite into our bed that we can trust but it won’t be weird after

PLEASE HELP this has been on my mind for months