How do I avoid telling a guy that I have breast implants?

Unless you got ones that are very cheap and don't feel like real breasts when touched he is not going to know. At some point if you get serious you will need to tell him as those implants have a shelf life of about 10 years before you will need new ones put in.

You can just not mention it, but unless he's an idiot, he'll know as soon as he sees and touches them. Doesn't matter how good implants are, they don't look real, and they don't feel real. He may not mention it out of politeness, but he's very likely to realize in short order.

Start off with low lighting and work it into the conversation, maybe, after five or seven dates.

Well I would wait to see what happens with this relationship before telling him all your personal stuff.

You will be getting personal if you are getting close. He won't mind at all, just don't say anything.

If he is your boyfriend, he has every right to know.. Honesty is the best policy