Almost anything is cool if there's good chemistry or especially love between sharing parties. As for anal play, yes clip your nails, don't want to perforate the colon/rectum, most disdain pain & blood, also not hygienic. Depth varies depending on experience and style. Never jam it all from the start. Experiment and openly communicate while doing so to discover personal preferences and techniques. Lube is a must, types also available for experimentation. Pussy juice is a definite turn on, let him watch you dip from your drip. As for licking, a definite personal favorite!! As long as its clean dive deep and enjoy. Licking the balls and area between the anus and balls also enhances the pleasure. If you like the way each other kiss orally. Kiss and lick it just like regular mouth kissing. Also imagine your tongue as a penis and have intercourse. If his nipples are sensitive play with them during as well. Ooo la la. Happy diving