A colleague uses a wallpaper manager which cycles through his collection of desktop wallpapers, a seemingly unending collection of tattooed women in lingerie. There is no nudity but the images are definitely sexualised in that the models all have large breasts, pouting or touching themselves, you get the idea.
I'm not a prude but I do find this to be somewhat unprofessional; although it may not technically be explicit content, it's the objectification of women which is distasteful and disrespectful. His screen is clearly in view of female co-workers during the day.
My colleague is a good developer and a decent guy, and we have a fine working relationship otherwise. I don't want to harm this good relationship by trying to resolve this issue in the wrong way.
Speak directly to him myself? How can I tactfully do this?
Mention my concerns to HR and let them deal with it on my behalf?
Ignore it and mind my own business?
[Your suggestion here...]
Clarifications: It's a minor distraction. I don't have a moral objection to the images but it's not the time and place for them - perhaps it gives the office a slightly sleazy atmosphere. I would rather simply ignore than sully the professional relationship with my colleagues, but if it can be stopped without anyone feeling like their freedoms have been impinged upon that would be ideal.