Are anal toys marketed to women such as butt plunger safe for men to use also?

You are right, the P-spot toys are designed specifically for men. These help reach and stimulate the prostate thanks to their particular shape and functions. However, anal plugs can be enjoyed by anyone. Plugs are used to prepare the anus for sex, stretch the canal, provide the feeling of fullness, and deliver you some different pleasant sensations.

I have selected some reviews on butt plugs written by our male customers:
First, check this gorgeous beginner-friendly glass plug - Cobalt. It is perfectly shaped to go in easily and deliver those sweet sensations. This review will answer all your questions.

Another great option is a vibrating butt plug - Backend delight. Classic shape and powerful motor, what else is needed for a start???
Here is one of the reviews for it.

When you decide to upgrade your level to an advanced user, consider the Booty throb. It is a bit on the bigger side, but its vibrations and pulsating membranes do wonders. Read this review.

As for the dildos, they can also be used by both women and men. However, those that are going to be used anally should have a base or a suction cup. Here are some that work well for beginners: a non-vibrating Cloud 9 and Secret Lover that vibrates to maximize the pleasure.

I hope these will help dispel your doubts.